[LTD fromlist] arm: nxp: k6x: Add default partition table.

Recent changes (6925504, 91f67a1, 84628e8, fa4a393) add support
for a partition table in the flash.  Add support for this to the nxp
k6x dtsi file.  By default, code will occupy the entire flash.  By
setting a chosen node in an application, the code can be linked into
one of the partitions.  For example, and app could create a
'frdm_k64f.overlay' file at the top of their project with:

	/ {
		chosen {
			zephyr,code-partition = &slot0_partition;
		};
	};

to place an application in slot 0.

Signed-off-by: David Brown <[email protected]>

dts/arm/nxp/nxp_k6x.dtsi

@@ -65,6 +65,34 @@
 
 			flash0: flash@0 {
 				reg = <0 0x100000>;
+
+				partitions {
+					compatible = "fixed-partitions";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					boot_partition: partition@0 {
+						label = "mcuboot";
+						reg = <0x00000000 0x00010000>;
+						read-only;
+					};
+					app_state_partition: partition@10000 {
+						label = "application-state";
+						reg = <0x00010000 0x00010000>;
+					};
+					slot0_partition: partition@20000 {
+						label = "image-0";
+						reg = <0x00020000 0x00060000>;
+					};
+					slot1_partition: partition@60000 {
+						label = "image-1";
+						reg = <0x00080000 0x00060000>;
+					};
+					scratch_partition: partition@e0000 {
+						label = "image-scratch";
+						reg = <0x000e0000 0x00020000>;
+					};
+				};
 			};
 		};