kconfig: update to Linux 5.7-rc2 ...

The previous sync was Linux 5.5. This updates Kconfig to Linux 5.7-rc2.

Highlights:

 - add yes2modconfig and mod2yesconfig, which are useful for coping with
   syzbot configs in Linux

 - remove include/config/tristate.conf

 - show more precise help

 - fix various issues of 'make xconfig'

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kconfig: update to Linux 5.2-rc4 ...

The previous sync was Linux 4.20. This updates Kconfig to Linux 5.2-rc4.

I adjusted the top Makefile as well because Linux commit 058507195b53
("kbuild: move ".config not found!" message from Kconfig to Makefile")
moved the .config check from Kconfig to Makefile.

I also made auto.conf a mandatory include file, and remove it from the
prerequisites of other targets. We are safe because Make is immediately
terminated when syncconfig fails to generate auto.conf.

Highlights:

 - The parser has no more shift/reduce conflicts

 - The lexer was rewritten more simply

 - The token lookup table was deleted

 - Replace license boilerplates with SPDX

 - Compile C files as separate units

 - Do not overwrite .config when the content was not changed

 - Lots of bug-fixes and cleanups

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kconfig: sync to Linux 4.20 ...

The previous sync was commit 18895514dc5e ("kconfig: update to
v3.18-rc6").

Some commits were applied on top of that since then, but equivalent
fixups were done in Linux.

So, this commit overwrites everything scripts/kconfig/ with the one
from Linux 4.20

Highlights:

 - 'silentoldconfig' has been renamed to 'syncconfig'
   (the top Makefile needs to be adjusted)

 - 'testconfig' target has been added for unit-tests
   (the top Makefile needs to export PYTHON3 because
    the test frame relies on Python3 and pytest)

 - The perfect hash table generated by gperf has been removed

 - The localization support has been removed

 - The 'option env=VAR' has been replaced with more generic
   variable reference syntax $(VAR)
   (./Kconfig and common/Kconfig need to be adjusted)

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

.gitignore: move *.lex.c *.tab.[ch] patterns to the top-level .gitignore ...

Linux commit 5988930

These patterns are common to host programs that require lexer and parser.
Move them to the top .gitignore.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kconfig: sync to linux v3.10-rc6 ...

This brings us some new features like directly jumping to search results.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

add gitignore file ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Kconfig: sync with linux kernel v2.6.36-rc1-168-ge36c886 ...

this will add also the support of the new ncurse interface nconfig

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

add .gitignore files