dma: ti: k3-udma: Fix static checker warnings

Fix below sparse warnings:

drivers/dma/ti/k3-udma.c:3013:24: warning: symbol 'am654_main_data' was not declared. Should it be static?
drivers/dma/ti/k3-udma.c:3022:24: warning: symbol 'am654_mcu_data' was not declared. Should it be static?

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

drivers/dma/ti/k3-udma.c

@@ -3018,7 +3018,7 @@ static struct dma_chan *udma_of_xlate(struct of_phandle_args *dma_spec,
 	return chan;
 }
 
-struct udma_match_data am654_main_data = {
+static struct udma_match_data am654_main_data = {
 	.enable_memcpy_support = true,
 	.tpl_levels = 2,
 	.level_start_idx = {
@@ -3027,7 +3027,7 @@ struct udma_match_data am654_main_data = {
 	},
 };
 
-struct udma_match_data am654_mcu_data = {
+static struct udma_match_data am654_mcu_data = {
 	.enable_memcpy_support = false, /* MEM_TO_MEM is slow via MCU UDMA */
 	.tpl_levels = 2,
 	.level_start_idx = {