ARM: dts: dra72-evm: Add vqmmc supply to mmc1

Add vqmmc-supply property to mmc1 dt node and populate
it with ldo1_reg to reflect ldo1_out is connected to mmc1 IO lines.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>