board: sl28: increase SPL_SYS_MALLOC_SIZE

Increase the malloc size to 2MiB because our FIT image exceeds the 1MiB
limit either if BL31 mode is enabled or if another device tree is added
to the image.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Tested-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
1 file changed