usb: qusb: Fix incorrect charger detection by HS PHY on bootup

The need for the core to be brought out of low power mode
and put it back in low power mode during the boot up
to ensure that the core is in a proper known state is
interfering with the charger detection sequence of the
HS PHY.

Normally on platforms where the PMIC charger does the
charger detection this was prevented with the dpdm
regulator is_enabled check. But on platforms where the
USB HS PHY does the charger detection, the PMIC does not
enable the DPDM regulator, so the glue driver goes ahead
and put the core in known low power state.

Fix this by setting the dpdm_enable to true when the
charger detection sequence is started and clear the
dpdm_enable and notify the DISABLE_EVENT to glue driver
after the charger detection is done.

Change-Id: Ic7e2ec54b483b925797a72270831808fcb2c8bcd
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>