crypto: x86 - Stop using cpu_has_xfeatures()

Checking both boot_cpu_has(X86_FEATURE_AVX*) and cpu_has_xfeatures() has never
really been needed in practice, and it's never been universally done (e.g.,
lib/raid/ omits cpu_has_xfeatures()).  Nevertheless, both x86 and UML now
explicitly clear the AVX and AVX-512 flags if their xfeatures are missing,
which should remove any remaining doubts.

Thus, remove all the calls to cpu_has_xfeatures(), as well as the related
checks of boot_cpu_has(X86_FEATURE_OSXSAVE).

In a few cases there was no corresponding boot_cpu_has(X86_FEATURE_AVX*)
check, so add the missing ones.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260901145740.42337-4-ebiggers@kernel.org

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