Add targets subdirectory to high level CMake configuration file and
create new configurations for MCUs and individual targets. Change the
interpreter in the ARM scatter file to armclang, which is required for
CMake. Remove private and public interfaces in emac target
configuration. Ensure that all targets build on the arm gcc compiler and
arm compiler.

Scancode found missing license notices in our source files. This commit
addresses those issues by adding an Apache-2.0 notice to source files
highlighted.

Since GPIO.PPR0 can not check clock mode, I changed it to set a fixed value for each board.

The OS timer of RZ/A1 uses P0 clock, so until now it has been set the value of P0 clock in SystemCoreClock.
Changed the system clock value to set to SystemCoreClock.
Changed to refer to P0 clock macro instead of SystemCoreClock in OS timer processing.

Update to 2-region model for HEAP and Stack Memory

Few targets already used 2-region memory model.

In case of unusing RTOS, there is no processing against IRQ handler and it causes a linker error.
Therefore, I added this processing with WEAK attribute. Also I added cmain.S file at cmsis/TARGET_CORTEX_A folder.

In case of unusing RTOS, IRQ handler executes "while(1)" and it causes a program freeze.
Therefore, I revised this processing.

In case of unusing RTOS, IRQ handler executes "while(1)" and it causes a program freeze.
Therefore, I revised this processing. Also I added the heap setting processing and set the align to 8 byte.

Renesas : Improve ARMCC linker script

Renesas : Modify LPTicker driver

For Arm toolchain build, Mbed 2(classic) programs occur an unexpected error if there is "#include "mem_XXXX.h"" in the script file.
It seems that the linker script can't find the include file because "mem_XXXX.h" file is not in the same path with the linker script.
(Refer to Issue #6975.)
To address this issue, I remove inclusion processing and define the related macros at ARMCC linker script file.

--legacyalign, --no_legacyalign are deprecated from ARMC6 compiler, in order to
remove deprecated flags all linker files (GCC and IAR as well to have uniformity)
should strictly align to 8-byte boundary

The mainly changes is below:
- Update scatter file, linker file for bootloader support
- Update the file for RZ/A1 serial flash boot loader
- Add "device name" and "bootloader_supported" in targets.json

The mainly changes is below:
- Add flash_api.c
- Add the definition of SPI multi I/O Bus controller that is used for flash access
- Add "FLASH" as device feature
- Add the macro regarding information of the incorporated Flash
- Add the processing to expand code to RAM

Removed debugging code, fixed errors indicated in the comments.

Regarding RZ_A1H, Since I removed the macro definition accidentally in iodefine_typedef, I fixed the lack of it.

Renesas mbed boards incorporate NVIC Wrapper because Cortex-A9 use GIC. For example, NVIC_SystemReset() is defined in nvic_wrapper.c and declared in nvic_wrapper.h.
Because I removed one of include processing accidentally, I fixed the lack.
This supplements PR #5890.

Registration GR-LYCHEE board as a new mbed board

To get cmsis nvic definitions, this header file should be included
in cmsis.h file.

Fixes #5886

Regarding "{" that show the function start, I modified the the arrangement from right of function to new line.