USB: EHCI: Fix suspend and resume handling

HSIC PHY stuck issue is observed if HSIC HW goes to low power
mode in the middle of resume sequence initiated by remote wakeup.
In case of USB bus resume due to remote wakeup set Run/Stop bit
right after receiving remote wakeup interrupt and do not allow
runtime suspend in the middle of remote wakeup.
Also, add correct way to update PORTSC register in driver suspend
and resume routines.

CRs-Fixed: 360555
Change-Id: I0033541042db028d85ef49907dfd37ad5a75c8aa
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
[sboyd: Only take ehci-hcd.c part]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>