ARM: at91/pm: rename file name: pm_slowclock.S --> pm_suspend.S

Because the sram function is used for both suspend to memory and the suspend
to standby mode, renaming is more elegant.
Signed-off-by: NWenyou Yang <wenyou.yang@atmel.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: NSylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/Makefile

@@ -13,7 +13,7 @@ obj-$(CONFIG_SOC_SAMA5)		+= sama5.o
 
 # Power Management
 obj-$(CONFIG_PM)		+= pm.o
-obj-$(CONFIG_PM)		+= pm_slowclock.o
+obj-$(CONFIG_PM)		+= pm_suspend.o
 
 ifeq ($(CONFIG_PM_DEBUG),y)
 CFLAGS_pm.o += -DDEBUG