USB: UICC: set bus->skip_resume to true for UICC drivers

As UICC devices are always present on the device, we want to avoid
unnecessary resume during system_resume even if we do not intend to do
UICC data transfers. Also setting skip_resume helps to avoid race seen
due to following sequence of events runtime_suspend, system_suspend (in
progress), runtime resume (started). Set bus->skip_resume to true for UICC
drivers to simplify suspend and resume sequences.

Change-Id: I330c189598679278dfeb2e8284bdd2b6ac050efe
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>