boards: dts: mimxrt1160_evk_cm4: sram shall not be put to ocram

as in mbox cases the ocram is used as code area, so shall not be used
as sram again. this is a typo introduced by
aec0355380

fixing: #82841

Signed-off-by: Hake Huang <hake.huang@oss.nxp.com>

boards/nxp/mimxrt1160_evk/mimxrt1160_evk_mimxrt1166_cm4.dts

@@ -20,7 +20,7 @@
 		 * sram region is changed and DMA is in use, you will
 		 * encounter issues!
 		 */
-		zephyr,sram = &ocram;
+		zephyr,sram = &sram1;
 		zephyr,console = &lpuart1;
 		zephyr,shell-uart = &lpuart1;
 		zephyr,flash-controller = &is25wp128;