phy: msm: qusb: Fix BC1.2 compliance failures

For Battery charging 1.2 compliance, device needs to apply VDP_SRC
for DCP charger after charger detection. Hence add required change
to apply VDP_SRC for DCP case. Also fix command time out issue
with CDP case as turning off regulators results in command timeout
while enabling Ep0 for enumeration.

Change-Id: I311a8c76d28bdb351c6d0c72f4430c95d79f0595
Signed-off-by: Vijayavardhan Vennapusa <quic_vvreddy@quicinc.com>