drivers: remoteproc: xlnx: Fix uninitialized tcm mode

Add "else" case for default tcm mode to silent following static check:

zynqmp_r5_cluster_init()
 error: uninitialized symbol 'tcm_mode'.

Fixes: a6b974b4 ("drivers: remoteproc: xlnx: Add Versal and Versal-NET support")
Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20240424163344.1344304-1-tanmay.shah@amd.comSigned-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

drivers/remoteproc/xlnx_r5_remoteproc.c

@@ -1006,6 +1006,8 @@ static int zynqmp_r5_cluster_init(struct zynqmp_r5_cluster *cluster)
 			tcm_mode = PM_RPU_TCM_COMB;
 		else
 			tcm_mode = PM_RPU_TCM_SPLIT;
+	} else {
+		tcm_mode = PM_RPU_TCM_COMB;
 	}
 
 	/*