kern/ieee1275/cmain/ppc64: Introduce flags to identify KVM and PowerVM

Introduce flags to identify PowerVM and KVM on Power and set them where
each type of host has been detected.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Pavithra Prakash <pavrampu@in.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Carolyn Scherrer <cpscherr@us.ibm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Sourabh Jain <sourabhjain@linux.ibm.com>

include/grub/ieee1275/ieee1275.h

@@ -141,6 +141,10 @@ enum grub_ieee1275_flag
    */
   GRUB_IEEE1275_FLAG_CAN_TRY_CAS_FOR_MORE_MEMORY,
 #endif
+
+  GRUB_IEEE1275_FLAG_POWER_VM,
+
+  GRUB_IEEE1275_FLAG_POWER_KVM,
 };
 
 extern int EXPORT_FUNC(grub_ieee1275_test_flag) (enum grub_ieee1275_flag flag);