* Start porting to Teensy 4.1, also fix some compiler warnings in FSL HAL

* Add hardware init for Teensy, refactor phy drivers, rework IMX EMAC autonegotiate code

* Revert some testing changes

* Fix incorrect phy address used outside of low_level_init_successful()

* Ethernet operational!

* Turn off DEBUG_IMX_EMAC

* Style fixes

* Style again

* Bugfix: mbed_lib.json files in project source dir were not getting picked up

* Bugfix: CLion debug configurations not generated properly due to variables going out of scope

* Support Teensy OTP MAC address

Update the flash driver to support both Hyper Flash
and QSPI Flash.

In addition, the static function cannot be linked to
SRAM even defined by AT_QUICKACCESS_SECTION_CODE macro.
So remove all "static" modifier for the FLASHIAP
functions.

Signed-off-by: Gavin Liu <gang.liu@nxp.com>

The memset function from c library will be linked in flash
space, it's risk for FLASHIAP. So I wrote flexspi_memset
to replace the memset for IMX FLASHIAP, and put the function
into targets/.../TARGET_IMX/flash_api.c file. All IMX Soc
platforms can declare it as extern and use in their Soc
flexspi driver files.

Signed-off-by: Gavin Liu <gang.liu@nxp.com>

These functions are used to READ/WRITE to the Flexspi NOR

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

1. Add the IVT header to the binary as this is required for boot up
   This was earlier added by the DAPLink firmware. As it is no longer
   handled in DAPLink, the header needs to be added inside mbed.
2. Update drivers

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>