xhci-tegra: enable reset SSPI through MBOX

xhci-tegra: enable reset SSPI through MBOX

Porting K310 change http://git-master/r/681376
to K44

Send mailbox to FW to do reset SSPI in correct
order:
1. set otg port PP=0
2. send MBOX_CMD_RESET_SSPI message to FW
and wait for ACK
3. set otg port PP=1

bug 200260253

Change-Id: I52676c737f44491a6743afb7dd61a59b5a58b77e
Signed-off-by: BH Hsieh <bhsieh@nvidia.com>
Reviewed-on: http://git-master/r/1267581
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Ashutosh Jha <ajha@nvidia.com>