m68k: sun3: Descend to prom from arch/m68k/sun3

Move prom/ to the more relevant Makefile.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20200526123810.301667-2-masahiroy@kernel.orgSigned-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/Kbuild

@@ -10,7 +10,7 @@ obj-$(CONFIG_MVME147)		+= mvme147/
 obj-$(CONFIG_MVME16x)		+= mvme16x/
 obj-$(CONFIG_BVME6000)		+= bvme6000/
 obj-$(CONFIG_SUN3X)		+= sun3x/ sun3/
-obj-$(CONFIG_SUN3)		+= sun3/ sun3/prom/
+obj-$(CONFIG_SUN3)		+= sun3/
 obj-$(CONFIG_NATFEAT)		+= emu/
 obj-$(CONFIG_M68040)		+= fpsp040/
 obj-$(CONFIG_M68060)		+= ifpsp060/

arch/m68k/sun3/Makefile

@@ -5,4 +5,4 @@
 
 obj-y	:= sun3ints.o sun3dvma.o idprom.o
 
-obj-$(CONFIG_SUN3) += config.o mmu_emu.o leds.o dvma.o intersil.o
+obj-$(CONFIG_SUN3) += config.o mmu_emu.o leds.o dvma.o intersil.o prom/