powerpc64: Set PPC64_ELF_ABI_v[1|2] macros to 1

Set macros to 1 so that they can be used with __is_defined().
Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/abad4868416ddfd42893f99c0cad8e5faf998095.1644834730.git.naveen.n.rao@linux.vnet.ibm.com

arch/powerpc/include/asm/types.h

@@ -13,9 +13,9 @@
 
 #ifdef __powerpc64__
 #if defined(_CALL_ELF) && _CALL_ELF == 2
-#define PPC64_ELF_ABI_v2
+#define PPC64_ELF_ABI_v2 1
 #else
-#define PPC64_ELF_ABI_v1
+#define PPC64_ELF_ABI_v1 1
 #endif
 #endif /* __powerpc64__ */