configs: am62x_evm_r5: Add CONFIG_NR_DRAM_BANKS as done in a53 defconfig

Add CONFIG_NR_DRAM_BANKS from am62x_evm_a53_defconfig as this is
needed to calculate the size of DDR that is available.

Signed-off-by: Georgi Vlaev <g-vlaev@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am62x_evm_r5_defconfig b/configs/am62x_evm_r5_defconfig
index 2e340cd..deafb92 100644
--- a/configs/am62x_evm_r5_defconfig
+++ b/configs/am62x_evm_r5_defconfig
@@ -3,6 +3,7 @@
 CONFIG_SYS_MALLOC_F_LEN=0x9000
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_NR_DRAM_BANKS=2
 CONFIG_SOC_K3_AM625=y
 CONFIG_TARGET_AM625_R5_EVM=y
 CONFIG_DM_GPIO=y