imx8m{m,n}_venice: update env memory layout

Update distro config env memory layout:
 - loadaddr=0x48200000 allows for 130MB area for uncompressing (ie FIT
   images, kernel_comp_addr_r)
 - fdt_addr_r = loadaddr + 128MB - allows for 128MB kernel
 - scriptaddr = fdt_addr_r + 512KB - allows for 512KB fdt
 - ramdisk_addr_r = scriptaddr + 512KB - allows for 512KB script

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/configs/imx8mm_venice_defconfig b/configs/imx8mm_venice_defconfig
index 7e6bb68..c68c150 100644
--- a/configs/imx8mm_venice_defconfig
+++ b/configs/imx8mm_venice_defconfig
@@ -16,7 +16,7 @@
 CONFIG_SPL_DRIVERS_MISC=y
 CONFIG_SPL=y
 CONFIG_ENV_OFFSET_REDUND=0xff8000
-CONFIG_SYS_LOAD_ADDR=0x40480000
+CONFIG_SYS_LOAD_ADDR=0x48200000
 CONFIG_SYS_MEMTEST_START=0x40000000
 CONFIG_SYS_MEMTEST_END=0x80000000
 CONFIG_LTO=y