msm_otg: Add module parameter for HSUSB phy init sequence

This change adds override_phy_init mod_param which can be used
to pass HSUSB PHY Configuration. This param can be used with
kernel command like below:

msm_otg.override_phy_init=0x44,0x80,0x6B,0x81,0x2E,0x82,0x33,0x83,-1

This can be useful to get Device Mode Eye Diagram test results with
different configuration without changing or making any build.

Change-Id: I9fda4c410850c938139ba30726ed507193f85bb2
Signed-off-by: Mayank Rana <mrana@codeaurora.org>