qcacmn: Check the p2p roc timer state by acquiring timer lock

In function p2p_process_scan_complete_evt roc timer state is checked
using the api qdf_mc_timer_get_current_state, this api does not take
timer lock while returning the state. In other thread, if the timer
state is changed then the wrong timer state is returned in current thread.
And wrong timer state can lead to destroying roc timer without stopping
it synchronously.
Call qdf_timer_stop_sync api without checking the timer state
as the timer already checking the state by taking a timer lock.

Change-Id: Idb22e405178f2e0f1ed80b7c8aac04170e5b69bc
CRs-Fixed: 2511768