boards: nrf9160dk: Enable external flash switch in board controller

Enable the external_flash_pins_routing switch in the board controller
overlay for nRF9160 DK revision 0.14.0 and newer. This is to match the
behaviour of the factory shipped borad controller on board revisions
that have external flash.

Signed-off-by: Gregers Gram Rygg <gregers.gram.rygg@nordicsemi.no>
diff --git a/boards/arm/nrf9160dk_nrf52840/nrf9160dk_nrf52840_0_14_0.overlay b/boards/arm/nrf9160dk_nrf52840/nrf9160dk_nrf52840_0_14_0.overlay
index ddd73df..4596fa1 100644
--- a/boards/arm/nrf9160dk_nrf52840/nrf9160dk_nrf52840_0_14_0.overlay
+++ b/boards/arm/nrf9160dk_nrf52840/nrf9160dk_nrf52840_0_14_0.overlay
@@ -21,7 +21,7 @@
 		external_flash_pins_routing: switch-ext-mem-ctrl {
 			compatible = "nordic,nrf9160dk-optional-routing";
 			control-gpios = <&gpio0 19 GPIO_ACTIVE_HIGH>;
-			status = "disabled";
+			status = "okay";
 		};
 	};
 };
diff --git a/doc/releases/release-notes-3.4.rst b/doc/releases/release-notes-3.4.rst
index e7c0f28..e0d0e35 100644
--- a/doc/releases/release-notes-3.4.rst
+++ b/doc/releases/release-notes-3.4.rst
@@ -318,6 +318,8 @@
     older revision of the nRF9160 DK without external flash, specify that
     older board revision when building.
 
+  * Enabled external_flash_pins_routing switch in ``nrf9160dk_nrf52840`` by default.
+
 * Made these changes for ARM64 boards:
 
 * Made these changes for RISC-V boards: