ARM: multi_v7_defconfig: Enable NXP pcf85363 rtc

The iWave RZ/G1C SBC supports RTC (NXP pcf85263). To increase
hardware support enable the driver in the multi_v7_defconfig
multiplatform configuration.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>