USB: dwc3-msm: Add module param to override USB LPM functionality

It is required to support USB LPM functionality with particular
composition to allow XO shutdown. This change adds module param
as usb_lpm_override. By default it is not set, set the same as
echo 1 > /sys/module/dwc3_msm/parameters/usb_lpm_override.
This would overrides currently used suspend_resume_no_support
variable and allows USB LPM on USB cable disconnect.

Change-Id: I220e65a714cd3ab5607c18ab459b9376418567c7
Signed-off-by: Mayank Rana <mrana@codeaurora.org>