usb: phy: Add support for init sequence for femto phy

Add support for power up init sequence to bring up the
Synopsys HS Femto phy in required configuration. Also
provide module param to be able to override the init
sequence passed from DT files.
Also, correct the MIN voltage for 1P8 regulator which
needs min and max to be the same as this is a fixed
regulator.

Change-Id: I50ae4cb382a3694922e1db097e689f2821ffd7ee
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>