ARM: rockchip: rename pm.c to rockchip_pm.c

arch/arm/mach-rockchip/Makefile

@@ -3,7 +3,7 @@ obj-y += cpu.o
 obj-y += rk3188.o
 obj-y += rk3288.o
 obj-y += ddr_freq.o
-obj-$(CONFIG_PM) += pm.o sleep.o
+obj-$(CONFIG_PM) += rockchip_pm.o sleep.o
 obj-$(CONFIG_RK_FPGA) += fpga.o
 obj-$(CONFIG_CPU_IDLE) += cpuidle.o
 obj-$(CONFIG_SMP) += platsmp.o