frdm-k22f: fix IAR definition

Based on the https://www.keil.com/boards2/nxp/frdm_k22f/ - it contains xxx12 MCU.
However IAR 7.80 has only xxx5 version, thus leaving NXP added version as xxx5.

Author: 0xc0170

tools/export/iar/iar_definitions.json

@@ -154,6 +154,9 @@
         "FPU2": 7,
         "NrRegs": 1
     },
+    "MKL43Z256xxx4": {
+        "OGChipSelectEditMenu": "MKL43Z256xxx4\tFreescale MKL43Z256xxx4"
+    },
     "LPC812M101JDH20": {
         "OGChipSelectEditMenu": "LPC812M101\tNXP LPC812M101"
     },