tpm2_key_protector: Enable build for powerpc_ieee1275

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/Makefile.core.def

@@ -2591,6 +2591,7 @@ module = {
   /* The plaform support of tpm2_key_protector depends on the tcg2 implementation in tss2. */
   enable = efi;
   enable = emu;
+  enable = powerpc_ieee1275;
   cppflags = '-I$(srcdir)/lib/tss2 -I$(srcdir)/lib/libtasn1-grub';
 };