app: boards: imx93_evk: change sram0 node name to dram

Zephyr commit 06227ba8792 ("boards: nxp: imx8m/n/p, imx93/5, fix ram
dts node name") changed the node name from `sram0` to `dram`. As such,
make this change on SOF side as well.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

Author: LaurentiuM1234

app/boards/imx93_evk_mimx9352_a55.overlay

@@ -9,7 +9,7 @@
 	/* Inmate memory, reserved through "mem=1248MB" boot argument,
 	 * starts at 0xce000000.
 	 */
-	sram0: memory@ce000000 {
+	dram: memory@ce000000 {
 		reg = <0xce000000 DT_SIZE_M(1)>;
 	};