configs: socfpga: add imply pl310 cache controller

Select the PL310 UCLASS_CACHE driver for SoCFPGA.

Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm/Kconfig

@@ -847,6 +847,7 @@ config ARCH_SOCFPGA
 	imply SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 	imply SPL_SPI_FLASH_SUPPORT
 	imply SPL_SPI_SUPPORT
+	imply L2X0_CACHE
 
 config ARCH_SUNXI
 	bool "Support sunxi (Allwinner) SoCs"