KVM: x86/mmu: Co-locate code for setting various SPTE masks

mainline inclusion
from mainline-v5.13-rc1
commit d6b87f25
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I7S3VQ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6b87f256591cf6be78825db6a09a5218666e539



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Squish all the code for (re)setting the various SPTE masks into one
location.  With the split code, it's not at all clear that the masks are
set once during module initialization.  This will allow a future patch to
clean up initialization of the masks without shuffling code all over
tarnation.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210225204749.1512652-17-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

conflict:
	arch/x86/kvm/vmx/vmx.c

Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>