drm/amdgpu: support B0&B1 external revision id for yellow carp

B0 internal rev_id is 0x01, B1 internal rev_id is 0x02.
The external rev_id for B0 and B1 is 0x20.
The original expression is not suitable for B1.

v2: squash in fix for display code (Alex)
Signed-off-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/amdgpu/nv.c

@@ -1257,7 +1257,7 @@ static int nv_common_early_init(void *handle)
 			AMD_PG_SUPPORT_VCN_DPG |
 			AMD_PG_SUPPORT_JPEG;
 		if (adev->pdev->device == 0x1681)
-			adev->external_rev_id = adev->rev_id + 0x19;
+			adev->external_rev_id = 0x20;
 		else
 			adev->external_rev_id = adev->rev_id + 0x01;
 		break;

drivers/gpu/drm/amd/display/include/dal_asic_id.h

@@ -227,7 +227,7 @@ enum {
 #define FAMILY_YELLOW_CARP                     146
 
 #define YELLOW_CARP_A0 0x01
-#define YELLOW_CARP_B0 0x1A
+#define YELLOW_CARP_B0 0x20
 #define YELLOW_CARP_UNKNOWN 0xFF
 
 #ifndef ASICREV_IS_YELLOW_CARP