ARM: dts: berlin2q-marvell-dmp: fix regulators' name

This patch fixes the following DTC warnings with W=1:

Warning (unit_address_vs_reg): Node /regulators/regulator@0 has a unit
name, but no reg property
Warning (unit_address_vs_reg): Node /regulators/regulator@1 has a unit
name, but no reg property
Warning (unit_address_vs_reg): Node /regulators/regulator@2 has a unit
name, but no reg property
Warning (unit_address_vs_reg): Node /regulators/regulator@3 has a unit
name, but no reg property
Warning (unit_address_vs_reg): Node /regulators/regulator@4 has a unit
name, but no reg property

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>