imx: Add 2GB lpddr support for i.MX8MN Beacon EmbeddedWorks devkit.

There is a second lpddr configuration with 2GB of RAM, but this requires
different RAM timings, so in addition to adding the timing file, a
separate defconfig is necessary.

Signed-off-by: Adam Ford <aford173@gmail.com>

board/beacon/imx8mn/Kconfig

@@ -13,6 +13,10 @@ config IMX8MN_FORCE_NOM_SOC
 	bool "Force to use nominal mode for SOC and ARM"
 	default n
 
+config IMX8MN_BEACON_2GB_LPDDR
+	bool "Enable 2GB LPDDR"
+	default n
+
 source "board/freescale/common/Kconfig"
 
 endif

board/beacon/imx8mn/MAINTAINERS

@@ -4,3 +4,4 @@ S:	Maintained
 F:	board/beacon/imx8mn/
 F:	include/configs/imx8mn_beacon.h
 F:	configs/imx8mn_beacon_defconfig
+F:	configs/imx8mn_beacon_2g_defconfig

board/beacon/imx8mn/Makefile

@@ -8,6 +8,9 @@ obj-y += imx8mn_beacon.o
 obj-y += ../../freescale/common/
 ifdef CONFIG_SPL_BUILD
 obj-y += spl.o
-obj-$(CONFIG_IMX8M_LPDDR4) += lpddr4_timing.o
-obj-$(CONFIG_IMX8M_DDR4) += ddr4_timing.o
+ifdef CONFIG_IMX8MN_BEACON_2GB_LPDDR
+obj-y += lpddr4_2g_timing.o
+else
+obj-y += lpddr4_timing.o
+endif
 endif