drm/amdgpu: Add interrupt SQ source struct to amdgpu_gfx struct v2.

SQ can generate interrupts on EDC/ECC errors and this struct controls
how the interrupt is handled.  The guts are filled in in the
gf_v<major>_<minor>.c files.

v2:
Rebase.
Signed-off-by: David Panariti <David.Panariti@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -969,6 +969,7 @@ struct amdgpu_gfx {
 	struct amdgpu_irq_src		priv_reg_irq;
 	struct amdgpu_irq_src		priv_inst_irq;
 	struct amdgpu_irq_src		cp_ecc_error_irq;
+	struct amdgpu_irq_src		sq_irq;
 	/* gfx status */
 	uint32_t			gfx_current_status;
 	/* ce ram size*/