drm/amdgpu: consolidate case statements

IP_VERSION(11, 0, 13) does the exact same thing as
IP_VERSION(11, 0, 12) so squash them together.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/psp_v11_0.c

@@ -216,13 +216,6 @@ static int psp_v11_0_init_microcode(struct psp_context *psp)
 	case IP_VERSION(11, 0, 7):
 	case IP_VERSION(11, 0, 11):
 	case IP_VERSION(11, 0, 12):
-		err = psp_init_sos_microcode(psp, chip_name);
-		if (err)
-			return err;
-		err = psp_init_ta_microcode(psp, chip_name);
-		if (err)
-			return err;
-		break;
 	case IP_VERSION(11, 0, 13):
 		err = psp_init_sos_microcode(psp, chip_name);
 		if (err)