ARM: imx: temporarily remove CONFIG_SOC_FSL from LS1021A

The newly introduced LS1021A SoC selects CONFIG_SOC_FSL, which
is originally symbol used for the PowerPC based platforms
and guards lots of code that does not build on ARM.

This breaks allmodconfig, so let's remove it for now, until
either all those drivers are fixed or they use a dependency
on IMX instead.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/Kconfig

@@ -658,14 +658,10 @@ choice
 
 endchoice
 
-config FSL_SOC
-	bool
-
 config SOC_LS1021A
 	bool "Freescale LS1021A support"
 	select ARM_GIC
 	select HAVE_ARM_ARCH_TIMER
-	select FSL_SOC
 	select PCI_DOMAINS if PCI
 	select ZONE_DMA if ARM_LPAE