ARM: dts: rockchip: rename label and nodename pinctrl subnodes that end with gpio

ARM: dts: rockchip: rename label and nodename pinctrl subnodes that end with gpio

A test with the command below gives for example this error:

arch/arm/boot/dts/rk3288-tinker.dt.yaml: tsadc: otp-gpio:
{'phandle': [[54]], 'rockchip,pins': [[0, 10, 0, 118]]}
is not of type 'array'

'gpio' is a sort of reserved nodename and should not be used
for pinctrl in combination with 'rockchip,pins', so change
nodes that end with 'gpio' to end with 'pin' or 'pins'.

make ARCH=arm dtbs_check
DT_SCHEMA_FILES=~/.local/lib/python3.5/site-packages/
dtschema/schemas/gpio/gpio.yaml

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200524160636.16547-1-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>