gdb/amd-dbgapi: pass amd_dbgapi_inferior_info to process_one_event

gdb/amd-dbgapi: pass amd_dbgapi_inferior_info to process_one_event

Pass the amd_dbgapi_inferior_info object from process_event_queue to
process_one_event.  Since process_event_queue pulls events for one
specific inferior, we know for which inferior the event is.  This
removes the need for process_one_event to do two dbgapi calls to get the
relevant pid.  If also removes one inferior lookup.

Change-Id: I22927e4b6251513eb3be95785082058aa3d09954
Approved-by: Lancelot Six <lancelot.six@amd.com>