ARM: dts: bcm283x: Apply pull settings to Zero W relevant groups

Instead of keeping the firmware's pull settings, we better apply
them via the devicetree pin control. Start with the RPi Zero W relevant
first to keep the effort low.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>