ASoC: wcd_cpe: Fix enum-conversion warnings

techpack/audio/asoc/codecs/wcd_cpe_services.c:658:17: error: implicit
conversion from enumeration type 'enum cpe_svc_result' to different
enumeration type 'enum cmi_api_result' [-Werror,-Wenum-conversion]
        notif.result = result;
                     ~ ^~~~~~
techpack/audio/asoc/codecs/wcd_cpe_services.c:1350:8: error: implicit
conversion from enumeration type 'enum cpe_svc_result' to different
enumeration type 'enum cpe_process_result' [-Werror,-Wenum-conversion]
                rc = cpe_send_msg_to_inbox(t_info, 0, m);
                   ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.

Change-Id: Ib9fce60017066e9c96e79195d7dba9ffb9177148