KVM: x86/mmu: Rename cr2_or_gpa to gpa in fast_page_fault

mainline inclusion
from mainline-v5.15-rc1
commit 76cd325e
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=76cd325ea75bb2a84c329782d7b8015b6a970c34



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fast_page_fault is only called from direct_page_fault where we know the
address is a gpa.

Fixes: 736c291c ("KVM: x86: Use gpa_t for cr2/gpa to fix TDP support on 32-bit KVM")
Reviewed-by: Ben Gardon <bgardon@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20210713220957.3493520-2-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>