Merge pull request #9657 from ARMmbed/revert-9496-Add_MXRT_IAR_Support

Revert "MIMXRT1050_EVK: Add IAR support in the exporter"

Author: Cruz Monrreal

tools/export/iar/iar_definitions.json

@@ -96,9 +96,6 @@
     "LPC54628J512ET180": {
         "OGChipSelectEditMenu": "LPC54618J512\tNXP LPC54618J512"
     },
-    "MIMXRT1052": {
-        "OGChipSelectEditMenu": "MIMXRT1052xxx6B\tNXP MIMXRT1052xxx6B"
-    },
     "STM32F072RB": {
         "OGChipSelectEditMenu": "STM32F072RB\tST STM32F072RB"
     },