powerpc/lib: fix redundant inclusion of quad.o

quad.o is only for PPC64, and already included in obj64-y,
so it doesn't have to be in obj-y

Fixes: 31bfdb03 ("powerpc: Use instruction emulation infrastructure to handle alignment faults")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/lib/Makefile

@@ -49,7 +49,7 @@ obj64-$(CONFIG_KPROBES_SANITY_TEST)	+= test_emulate_step.o \
 obj-y			+= checksum_$(BITS).o checksum_wrappers.o \
 			   string_$(BITS).o
 
-obj-y			+= sstep.o ldstfp.o quad.o
+obj-y			+= sstep.o ldstfp.o
 obj64-y			+= quad.o
 
 obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o