Convert CONFIG_SYS_L2_PL310 to Kconfig

This converts CONFIG_SYS_L2_PL310 to Kconfig.

For omap2 and mvebu the 'select SYS_L2_PL310' locations were
determined using ./tools/moveconfig -i CONFIG_SYS_L2_PL310.

For mx6 I manually chose ARCH_MX6 as 'select' location. The
correctness has been verified using

	$ ./tools/moveconfig.py -f ARCH_MX6 ~SYS_L2_PL310 ~SYS_L2CACHE_OFF
	0 matches

That means whenever an ARCH_MX6 board had SYS_L2_PL310 disabled, this
was correctly reflected in SYS_L2CACHE_OFF. Thus it's safe to insert
the 'select' statement under ARCH_MX6.

Signed-off-by: Philip Oberfichtner <pro@denx.de>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index a81b8e2..2ebe341 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -14,6 +14,7 @@
 	select SPL_SKIP_LOWLEVEL_INIT if SPL
 	select SPL_SIMPLE_BUS if SPL
 	select SUPPORT_SPL
+	select SYS_L2_PL310 if !SYS_L2CACHE_OFF
 	select TRANSLATION_OFFSET
 	select SPL_SYS_NO_VECTOR_TABLE if SPL
 	select ARCH_VERY_EARLY_INIT
diff --git a/arch/arm/mach-mvebu/include/mach/config.h b/arch/arm/mach-mvebu/include/mach/config.h
index 4add0d9..0bba0a4 100644
--- a/arch/arm/mach-mvebu/include/mach/config.h
+++ b/arch/arm/mach-mvebu/include/mach/config.h
@@ -25,8 +25,6 @@
 #define MV88F78X60 /* for the DDR training bin_hdr code */
 #endif
 
-#define CONFIG_SYS_L2_PL310
-
 #define MV_UART_CONSOLE_BASE		MVEBU_UART0_BASE
 
 /* Needed for SPI NOR booting in SPL */