Merge pull request #14350 from LDong-Arm/fix_iar_config_conflict

ARM_MPS2_Target: Fix conflicts in IAR configuration

Author: 0xc0170

targets/targets.json

@@ -4423,8 +4423,7 @@
         "core": "Cortex-M0",
         "supported_toolchains": [
             "ARM",
-            "GCC_ARM",
-            "IAR"
+            "GCC_ARM"
         ],
         "extra_labels": [
             "ARM_SSG",
@@ -4465,8 +4464,7 @@
         "core": "Cortex-M0+",
         "supported_toolchains": [
             "ARM",
-            "GCC_ARM",
-            "IAR"
+            "GCC_ARM"
         ],
         "extra_labels": [
             "ARM_SSG",
@@ -4505,8 +4503,7 @@
         "core": "Cortex-M3",
         "supported_toolchains": [
             "ARM",
-            "GCC_ARM",
-            "IAR"
+            "GCC_ARM"
         ],
         "extra_labels": [
             "ARM_SSG",
@@ -4546,8 +4543,7 @@
         "core": "Cortex-M4F",
         "supported_toolchains": [
             "ARM",
-            "GCC_ARM",
-            "IAR"
+            "GCC_ARM"
         ],
         "extra_labels": [
             "ARM_SSG",
@@ -4587,8 +4583,7 @@
         "core": "Cortex-M7FD",
         "supported_toolchains": [
             "ARM",
-            "GCC_ARM",
-            "IAR"
+            "GCC_ARM"
         ],
         "extra_labels": [
             "ARM_SSG",