uboot-imx

ARM: DRA7: Make do_set_mux32() generic

do_set_mux32() is redefined in dra7xx and beagle_x15 boards.
IO delay recalibration sequence also needs this.
Making it generic to avoid duplication.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>