Change return type of following APIs from int to QDF_STATUS.
wmi_unified_register_event()
wmi_unified_register_event_handler()
wmi_unified_register_raw_event_handler()
wmi_unified_unregister_event()
wmi_unified_unregister_event_handler()
Change-Id: I534b499edbcfec6eddea0e9ed48f9eb1a2e872c8
CRs-Fixed: 2791275
qdf_mem_malloc() function already takes care of logging the
caller function name and line number in case of any allocation error.
Hence there is no need to add the error log again.
Getting rid of these unnecessary logs reduces driver memory footprint.
Change-Id: If0b9425f82f9ed793c7639c0ed09eb1f868b6d5c
CRs-Fixed: 2781932
