Revert "scripts/clang-tools: Handle included .c files in gen_compile_commands"

Revert "scripts/clang-tools: Handle included .c files in gen_compile_commands"

This reverts commit 9362d34acf91a706c543d919ade3e651b9bd2d6f.

Dmitry Vyukov reported that commit 9362d34acf91 ("scripts/clang-tools:
Handle included .c files in gen_compile_commands") generates false
entries in some cases for C files that are included in other C files but
not meant for standalone compilation.

For properly supporting clangd, including .c files is discouraged.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Closes: https://lore.kernel.org/r/CACT4Y+Z8aCz0XcoJx9XXPHZSZHxGF8Kx9iUbFarhpTSEPDhMfg@mail.gmail.com
Acked-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: 9362d34acf91 ("scripts/clang-tools: Handle included .c files in gen_compile_commands")
Link: https://patch.msgid.link/20251217-revert-scripts-clang-rools-handle-included-c-files-v1-1-def5651446da@kernel.org
Signed-off-by: Nicolas Schier <nsc@kernel.org>