uboot-imx

igep00x0: Use the SRAM available for SPL.

Move CONFIG_SPL_TEXT_BASE down to 0x40200000 and set CONFIG_SPL_MAX_SIZE
to (SRAM_SCRATCH_SPACE_ADDR - CONFIG_SPL_TEXT_BASE), so that it's clear
what the limit is.

This will also help some compilers to fit all the code into the allocated
space.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>