ARM: imx5: drop option MACH_IMX51_DT

Since i.MX51 becomes DT only now, we can drop option MACH_IMX51_DT and
just use SOC_IMX51 instead.  While at it, rename imx51-dt.c to
mach-imx51.c to align with the name schema of other IMX DT only
platforms.
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/configs/imx_v6_v7_defconfig

@@ -31,7 +31,7 @@ CONFIG_MACH_IMX35_DT=y
 CONFIG_MACH_PCM043=y
 CONFIG_MACH_MX35_3DS=y
 CONFIG_MACH_VPR200=y
-CONFIG_MACH_IMX51_DT=y
+CONFIG_SOC_IMX51=y
 CONFIG_SOC_IMX50=y
 CONFIG_SOC_IMX53=y
 CONFIG_SOC_IMX6Q=y

arch/arm/configs/multi_v7_defconfig

@@ -27,7 +27,7 @@ CONFIG_ARCH_HIGHBANK=y
 CONFIG_ARCH_HI3xxx=y
 CONFIG_ARCH_KEYSTONE=y
 CONFIG_ARCH_MXC=y
-CONFIG_MACH_IMX51_DT=y
+CONFIG_SOC_IMX51=y
 CONFIG_SOC_IMX53=y
 CONFIG_SOC_IMX6Q=y
 CONFIG_SOC_IMX6SL=y

arch/arm/mach-imx/Kconfig

@@ -694,11 +694,6 @@ config SOC_IMX5
 	select HAVE_IMX_SRC
 	select MXC_TZIC
 
-config	SOC_IMX51
-	bool
-	select PINCTRL_IMX51
-	select SOC_IMX5
-
 config	SOC_IMX50
 	bool "i.MX50 support"
 	select PINCTRL_IMX50
@@ -707,9 +702,10 @@ config	SOC_IMX50
 	help
 	  This enables support for Freescale i.MX50 processor.
 
-config MACH_IMX51_DT
+config SOC_IMX51
 	bool "i.MX51 support"
-	select SOC_IMX51
+	select PINCTRL_IMX51
+	select SOC_IMX5
 	help
 	  This enables support for Freescale i.MX51 processor
 

arch/arm/mach-imx/Makefile

@@ -109,8 +109,8 @@ obj-$(CONFIG_SOC_IMX6) += suspend-imx6.o
 endif
 obj-$(CONFIG_SOC_IMX6) += pm-imx6.o
 
-obj-$(CONFIG_MACH_IMX51_DT) += imx51-dt.o
 obj-$(CONFIG_SOC_IMX50) += mach-imx50.o
+obj-$(CONFIG_SOC_IMX51) += mach-imx51.o
 obj-$(CONFIG_SOC_IMX53) += mach-imx53.o
 
 obj-$(CONFIG_SOC_VF610) += clk-vf610.o mach-vf610.o