From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
qspi_bk1_pins_a and qspi_bk2_pins_a pinctrl phandle has been splitted in
2 parts. Only stm32mp157c-ev1.dts has been updated properly.
Fix qspi pinctrl phandle for other boards which are based on stm32mp15x SoC.