ARM: dts: qcom: ipq8064: add multiple missing pin definition

Add missing definition for mdio0 pins used for gpio-bitbang driver,i2c4
pins and rgmii2 pins for ipq8064.

Drop i2c4_pins node from ipq8064-ap148 dts as it's now moved to ipq8064
dtsi.

Drop mdio0_pins node from ipq8064-rb3011 dts as it's now moved to
ipq8064 dtsi.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Tested-by: Jonathan McDowell <noodles@earth.li>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220707010943.20857-2-ansuelsmth@gmail.com