configs: dra7xx_evm: Increase the size of SPL_MULTI_DTB_FIT

Expand SPL_MULTI_DTB_FIT to accommodate usb peripheral nodes being
added to support SPL_DFU bootmode.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
2 files changed