kbuild: remove kbuild cache

kbuild: remove kbuild cache

The kbuild cache was introduced to remember the result of shell
commands, some of which are expensive to compute, such as
$(call cc-option,...).

However, this turned out not so clever as I had first expected.
Actually, it is problematic.  For example, "$(CC) -print-file-name"
is cached.  If the compiler is updated, the stale search path causes
build error, which is difficult to figure out.  Another problem
scenario is cache files could be touched while install targets are
running under the root permission.  We can patch them if desired,
but the build infrastructure is getting uglier and uglier.

Now, we are going to move compiler flag tests to the configuration
phase.  If this is completed, the result of compiler tests will be
naturally cached in the .config file.  We will not have performance
issues of incremental building since this testing only happens at
Kconfig time.

To start this work with a cleaner code base, remove the kbuild
cache first.

Revert the following commits:
Commit 85d6d67d99a9 ("kbuild: create directory for make cache only when necessary")
Commit bc53f6bf92f2 ("kbuild: shrink .cache.mk when it exceeds 1000 lines")
Commit 02f08324ed57 ("kbuild: Cache a few more calls to the compiler")
Commit bd941bd0c487 ("kbuild: Add a cache for generated variables")

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kees Cook <keescook@chromium.org>