configs: am64x_evm_r5: Add CONFIG_NR_DRAM_BANKS as done in a53 defconfig

Add CONFIG_NR_DRAM_BANKS from am64x_evm_a53_defconfig as this is needed
to calculate the size of DDR that is available.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
1 file changed