regulator: pbias: Add PBIAS regulator for proper voltage switching on MMC1
In the TI SOCs a PBIAS cell exists to provide a bias voltage to the MMC1 IO cells. Without this bias voltage these I/O cells can not function properly. The PBIAS cell is controlled by software. Signed-off-by: NJean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: NTom Rini <trini@konsulko.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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