ARM: dts: mba6ulx: add missing vcc supplies to i2c devices

This fixes the warnings:
pca953x 3-0020: supply vcc not found, using dummy regulator
pca953x 3-0021: supply vcc not found, using dummy regulator
pca953x 3-0022: supply vcc not found, using dummy regulator
at24 3-0051: supply vcc not found, using dummy regulator

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>