boards: nxp: mimxrt1160_evk: improve zephyr,flash location for M4

- Fixes issue where zephyr,flash in ocram node overlaps with physical
  SRAM sram1 used for zephyr,sram.
- Moves default zephyr,flash from external flash to M4 ITCM to improve
  performance.
- Updates overlays that moved zephyr,flash to ocram now use default

Signed-off-by: Derek Snell <[email protected]>

Author: DerekSnell

boards/nxp/mimxrt1160_evk/mimxrt1160_evk_mimxrt1166_cm4.dts

@@ -24,7 +24,7 @@
 		zephyr,console = &lpuart1;
 		zephyr,shell-uart = &lpuart1;
 		zephyr,flash-controller = &is25wp128;
-		zephyr,flash = &is25wp128;
+		zephyr,flash = &ocram_m4_itcm;
 		nxp,m4-partition = &slot1_partition;
 		zephyr,ipc = &mailbox_b;
 	};

samples/drivers/mbox/remote/boards/mimxrt1160_evk_mimxrt1166_cm4.overlay

@@ -6,7 +6,6 @@
 
 / {
 	chosen {
-		zephyr,flash = &ocram;
 		zephyr,console = &lpuart1;
 		zephyr,shell-uart = &lpuart1;
 

samples/drivers/mbox_data/remote/boards/mimxrt1160_evk_mimxrt1166_cm4.overlay

@@ -6,7 +6,6 @@
 
 / {
 	chosen {
-		zephyr,flash = &ocram;
 		zephyr,console = &lpuart2;
 		zephyr,shell-uart = &lpuart2;
 

samples/subsys/ipc/ipc_service/static_vrings/remote/boards/mimxrt1160_evk_mimxrt1166_cm4.overlay

@@ -9,7 +9,6 @@
 
 / {
 	chosen {
-		zephyr,flash = &ocram;
 		zephyr,console = &lpuart2;
 		zephyr,shell-uart = &lpuart2;
 

samples/subsys/ipc/openamp/remote/boards/mimxrt1160_evk_mimxrt1166_cm4.overlay

@@ -9,7 +9,6 @@
 / {
 	/* Switch to lpuart2, since primary core uses lpuart1 */
 	chosen {
-		zephyr,flash = &ocram;
 		zephyr,console = &lpuart2;
 		zephyr,shell-uart = &lpuart2;
 		zephyr,ipc_shm = &ocram2_overlay;

tests/drivers/mbox/mbox_data/remote/boards/mimxrt1160_evk_mimxrt1166_cm4.overlay

@@ -6,7 +6,6 @@
 
 / {
 	chosen {
-		zephyr,flash = &ocram;
 		zephyr,console = &lpuart2;
 		zephyr,shell-uart = &lpuart2;