Revert upstream commit 27c90e5e48d0

It changed the #pinctrl-cells value to be equal to 2 and the macro
that generates the values.
Based on the bindings docs a value of 2 is only acceptable if the node
used pinctrl-single,bits and not pinctrl-single,pins

This allow booting further on the beaglebone black with 5.9 DTS