KVM: x86: Fix implicit enum conversion goof in scattered reverse CPUID code

KVM: x86: Fix implicit enum conversion goof in scattered reverse CPUID code

Take "enum kvm_only_cpuid_leafs" in scattered specific CPUID helpers
(which is obvious in hindsight), and use "unsigned int" for leafs that
can be the kernel's standard "enum cpuid_leaf" or the aforementioned
KVM-only variant.  Loss of the enum params is a bit disapponting, but
gcc obviously isn't providing any extra sanity checks, and the various
BUILD_BUG_ON() assertions ensure the input is in range.

This fixes implicit enum conversions that are detected by clang-11:

arch/x86/kvm/cpuid.c:499:29: warning: implicit conversion from enumeration type 'enum kvm_only_cpuid_leafs' to different enumeration type 'enum cpuid_leafs' [-Wenum-conversion]
        kvm_cpu_cap_init_scattered(CPUID_12_EAX,
        ~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~~~~~~~~~~~
arch/x86/kvm/cpuid.c:837:31: warning: implicit conversion from enumeration type 'enum kvm_only_cpuid_leafs' to different enumeration type 'enum cpuid_leafs' [-Wenum-conversion]
                cpuid_entry_override(entry, CPUID_12_EAX);
                ~~~~~~~~~~~~~~~~~~~~        ^~~~~~~~~~~~
2 warnings generated.

Fixes: 4e66c0cb79b7 ("KVM: x86: Add support for reverse CPUID lookup of scattered features")
Cc: Kai Huang <kai.huang@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210421010850.3009718-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>