x86/cpufeatures: Remove {disabled,required}-features.h

x86/cpufeatures: Remove {disabled,required}-features.h

The functionalities of {disabled,required}-features.h have been replaced with
the auto-generated generated/<asm/cpufeaturemasks.h> header.

Thus they are no longer needed and can be removed.

None of the macros defined in {disabled,required}-features.h is used in tools,
delete them too.

Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250305184725.3341760-4-xin@zytor.com