MAINTAINERS: Set pinctrl binding entry for all Actions Semi Owl SoCs

Update the pinctrl binding entry to match all members of Actions Semi
Owl SoCs.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Link: https://lore.kernel.org/r/1a9eb2b12c151d4d765d2aa74dc9cd58b3c117dc.1596461275.git.cristian.ciocaltea@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>