ARM: imx: remove unnecessary ARCH_HAS_OPP select

Since ARCH_MXC already selects ARCH_HAS_OPP, it's really unnecessary for
SOC_IMX27 and SOC_IMX5 to select it again.
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/mach-imx/Kconfig

@@ -85,7 +85,6 @@ config SOC_IMX25
 
 config SOC_IMX27
 	bool
-	select ARCH_HAS_OPP
 	select CPU_ARM926T
 	select IMX_HAVE_IOMUX_V1
 	select MXC_AVIC
@@ -659,7 +658,6 @@ comment "Device tree only"
 
 config SOC_IMX5
 	bool
-	select ARCH_HAS_OPP
 	select HAVE_IMX_SRC
 	select MXC_TZIC