ARM: shmobile: Use pm-rmobile on sh7372 and r8a7740 only

The functions in pm-rmobile.c are only used on sh7372 and
r8a7740, so adjust the Makefile to only link in that file
in case those SoCs are selected.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/Makefile

@@ -28,11 +28,10 @@ obj-$(CONFIG_ARCH_R8A7740)	+= entry-intc.o
 # PM objects
 obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
-obj-$(CONFIG_ARCH_SHMOBILE)	+= pm-rmobile.o
-obj-$(CONFIG_ARCH_SH7372)	+= pm-sh7372.o sleep-sh7372.o
-obj-$(CONFIG_ARCH_R8A7740)	+= pm-r8a7740.o
-obj-$(CONFIG_ARCH_R8A7779)	+= pm-r8a7779.o
+obj-$(CONFIG_ARCH_SH7372)	+= pm-sh7372.o sleep-sh7372.o pm-rmobile.o
 obj-$(CONFIG_ARCH_SH73A0)	+= pm-sh73a0.o
+obj-$(CONFIG_ARCH_R8A7740)	+= pm-r8a7740.o pm-rmobile.o
+obj-$(CONFIG_ARCH_R8A7779)	+= pm-r8a7779.o
 
 # Board objects
 obj-$(CONFIG_MACH_APE6EVM)	+= board-ape6evm.o