powerpc/kvm: Fix build error when PPC_MEM_KEYS/PPC_PSERIES=n

lkp reported a randconfig failure:

     In file included from arch/powerpc/include/asm/book3s/64/pkeys.h:6,
                    from arch/powerpc/kvm/book3s_64_mmu_host.c:15:
     arch/powerpc/include/asm/book3s/64/hash-pkey.h: In function 'hash__vmflag_to_pte_pkey_bits':
  >> arch/powerpc/include/asm/book3s/64/hash-pkey.h:10:23: error: 'VM_PKEY_BIT0' undeclared
        10 |  return (((vm_flags & VM_PKEY_BIT0) ? H_PTE_PKEY_BIT0 : 0x0UL) |
         |                       ^~~~~~~~~~~~

We added the include of book3s/64/pkeys.h for pte_to_hpte_pkey_bits(),
but that header on its own should only be included when PPC_MEM_KEYS=y.
Instead include linux/pkeys.h, which brings in the right definitions
when PPC_MEM_KEYS=y and also provides empty stubs when PPC_MEM_KEYS=n.

Fixes: e4e8bc1 ("powerpc/kvm: Fix PR KVM with KUAP/MEM_KEYS enabled")
Cc: [email protected] # v5.11+
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: mpe

arch/powerpc/kvm/book3s_64_mmu_host.c

@@ -8,11 +8,11 @@
  */
 
 #include <linux/kvm_host.h>
+#include <linux/pkeys.h>
 
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 #include <asm/book3s/64/mmu-hash.h>
-#include <asm/book3s/64/pkeys.h>
 #include <asm/machdep.h>
 #include <asm/mmu_context.h>
 #include <asm/hw_irq.h>