usb: pd: Use break instead of return after soft reset is done

After soft reset is done from PE_SRC_SEND_CAPABILITIES use
break to exit from the switch case instead of returning from
the function.

Change-Id: I36e3f34cf90b6620dd6ac8b9c9a503cf336e47c5
Signed-off-by: Rohith Kollalsi <rkollals@codeaurora.org>