dwc3: core: remove calling phy_set_suspend() in dwc3_remove()

If glue driver's probe failed, it tries to remove child devices
as part of of_platform_depopulate during cleanup. This results in
calling dwc3 core platform device's remove callback dwc3_remove().
This function is calling phy_set_suspend() for both HSPHY and SSPHY
to suspend them.  But it is resulting in crash due to unclocked access.
Remove those calls, which are not required as glue driver will take
care of suspend/resume PHYs.

Change-Id: I3e107c4beb29373d4a1c783bd2be7a128f52317e
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>