x86/cpufeatures: Clean up formatting

It is a special file with special formatting so remove one whitespace
damage and format newer defines like the rest.

No functional changes.

 [ Xin: Do the same to tools/arch/x86/include/asm/cpufeatures.h. ]

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250415175410.2944032-2-xin@zytor.com