target-sparc: Rename cpu_init.c

Align QOM'ified targets, with a view to simplify Makefile.target.
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Makefile.target

@@ -96,7 +96,7 @@ libobj-$(TARGET_ARM) += cpu.o
 libobj-$(TARGET_S390X) += cpu.o
 ifeq ($(TARGET_BASE_ARCH), sparc)
 libobj-y += fop_helper.o cc_helper.o win_helper.o mmu_helper.o ldst_helper.o
-libobj-y += cpu_init.o
+libobj-y += cpu.o
 endif
 libobj-$(TARGET_SPARC) += int32_helper.o
 libobj-$(TARGET_SPARC64) += int64_helper.o