phy: cadence: sierra: Fix for USB3 U1/U2 state

Updated values of USB3 related Sierra PHY registers.
This change fixes USB3 device disconnect issue observed
while enternig U1/U2 state.

Signed-off-by: Sanket Parmar <sparmar@cadence.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>