uboot-imx

stm32mp: regulator: add SoC pwr regulator support

This driver binds and manages the following regulator of
SoC's PWR block :
  - reg11
  - reg18
  - usb33

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>