drm/amdgpu: add DMUB outbox event IRQ source define/complete/debug flag

[Why & How]
We use outbox interrupt that allows us to do the AUX via DMUB
Therefore, we need to add some irq source related definition
in the header files;
Signed-off-by: Jude Shih <shenshih@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -922,6 +922,7 @@ struct amdgpu_device {
 	struct amdgpu_irq_src		pageflip_irq;
 	struct amdgpu_irq_src		hpd_irq;
 	struct amdgpu_irq_src		dmub_trace_irq;
+	struct amdgpu_irq_src		dmub_outbox_irq;
 
 	/* rings */
 	u64				fence_context;

drivers/gpu/drm/amd/include/ivsrcid/dcn/irqsrcs_dcn_1_0.h

@@ -1132,5 +1132,7 @@
 
 #define DCN_1_0__SRCID__DMCUB_OUTBOX_HIGH_PRIORITY_READY_INT       0x68
 #define DCN_1_0__CTXID__DMCUB_OUTBOX_HIGH_PRIORITY_READY_INT       6
+#define DCN_1_0__SRCID__DMCUB_OUTBOX_LOW_PRIORITY_READY_INT        0x68 // DMCUB_IHC_outbox1_ready_int IHC_DMCUB_outbox1_ready_int_ack DMCUB_OUTBOX_LOW_PRIORITY_READY_INTERRUPT DISP_INTERRUPT_STATUS_CONTINUE24 Level/Pulse
+#define DCN_1_0__CTXID__DMCUB_OUTBOX_LOW_PRIORITY_READY_INT        8
 
 #endif // __IRQSRCS_DCN_1_0_H__