arm64: dts: imx8mq-librem5: add a RO firmware partition

This partition will hold a squashfs firmware jail. Only one read-only
partition is needed.
Signed-off-by: NAngus Ainslie <angus@akkea.ca>
Signed-off-by: NMartin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -325,15 +325,10 @@
 		};
 
 		partition@30000 {
-			label = "protected1";
-			reg = <0x30000 0x10000>;
+			label = "firmware";
+			reg = <0x30000 0x1d0000>;
 			read-only;
 		};
-
-		partition@40000 {
-			label = "rw";
-			reg = <0x40000 0x1C0000>;
-		};
 	};
 };