ARM: dove: add additional pinctrl registers

Dove pinctrl uses additional registers to control MPPs. This patch first
increases existing pinctrl reg property by one register, and then adds
two new ranges for MPP4 and PMU MPP registers.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>