ARM: imx: move timer driver into drivers/clocksource

After the cleanup on imx timer driver, now it's ready to be moved into
drivers/clocksource/.  Let's do it.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

arch/arm/mach-imx/Kconfig

@@ -2,7 +2,7 @@ menuconfig ARCH_MXC
 	bool "Freescale i.MX family" if ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_CPU_SUSPEND if PM
-	select CLKSRC_MMIO
+	select CLKSRC_IMX_GPT
 	select GENERIC_IRQ_CHIP
 	select PINCTRL
 	select PM_OPP if PM

arch/arm/mach-imx/Makefile

-obj-y := time.o cpu.o system.o irq-common.o
+obj-y := cpu.o system.o irq-common.o
 
 obj-$(CONFIG_SOC_IMX1) += mm-imx1.o
 obj-$(CONFIG_SOC_IMX21) += mm-imx21.o

drivers/clocksource/Kconfig

@@ -258,4 +258,10 @@ config CLKSRC_PXA
 	help
 	  This enables OST0 support available on PXA and SA-11x0
 	  platforms.
+
+config CLKSRC_IMX_GPT
+	bool "Clocksource using i.MX GPT" if COMPILE_TEST
+	depends on ARM && CLKDEV_LOOKUP
+	select CLKSRC_MMIO
+
 endmenu

drivers/clocksource/Makefile

@@ -51,4 +51,5 @@ obj-$(CONFIG_ARCH_KEYSTONE)		+= timer-keystone.o
 obj-$(CONFIG_ARCH_INTEGRATOR_AP)	+= timer-integrator-ap.o
 obj-$(CONFIG_CLKSRC_VERSATILE)		+= versatile.o
 obj-$(CONFIG_CLKSRC_MIPS_GIC)		+= mips-gic-timer.o
+obj-$(CONFIG_CLKSRC_IMX_GPT)		+= timer-imx-gpt.o
 obj-$(CONFIG_ASM9260_TIMER)		+= asm9260_timer.o