ARM: bcm2835: dt: Use pinctrl header

This patch converts all bcm2835 dts and dtsi files to use the pinctrl
header file.

Reviewed-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>