Remove ARDUINO form factor for nano devices

Remove ARDUINO from supported form factors on devices which have the
physical form factor of the arduino nano.

Author: c1728p9

targets/targets.json

@@ -2035,7 +2035,6 @@
     },
     "NUCLEO_F031K6": {
         "inherits": ["FAMILY_STM32"],
-        "supported_form_factors": ["ARDUINO"],
         "core": "Cortex-M0",
         "default_toolchain": "uARM",
         "extra_labels_add": ["STM32F0", "STM32F031K6"],
@@ -2060,7 +2059,6 @@
     },
     "NUCLEO_F042K6": {
         "inherits": ["FAMILY_STM32"],
-        "supported_form_factors": ["ARDUINO"],
         "core": "Cortex-M0",
         "default_toolchain": "uARM",
         "extra_labels_add": ["STM32F0", "STM32F042K6"],
@@ -2245,7 +2243,6 @@
     },
     "NUCLEO_F303K8": {
         "inherits": ["FAMILY_STM32"],
-        "supported_form_factors": ["ARDUINO"],
         "core": "Cortex-M4F",
         "extra_labels_add": ["STM32F3", "STM32F303x8", "STM32F303K8"],
         "config": {
@@ -3041,7 +3038,6 @@
         "core": "Cortex-M0+",
         "extra_labels_add": ["STM32L0", "STM32L031K6"],
         "default_toolchain": "uARM",
-        "supported_form_factors": ["ARDUINO"],
         "config": {
             "clock_source": {
                 "help": "Mask value : USE_PLL_HSE_EXTC (need HW patch) | USE_PLL_HSE_XTAL (need HW patch) | USE_PLL_HSI",
@@ -3148,7 +3144,6 @@
     },
     "NUCLEO_L432KC": {
         "inherits": ["FAMILY_STM32"],
-        "supported_form_factors": ["ARDUINO"],
         "core": "Cortex-M4F",
         "extra_labels_add": ["STM32L4", "STM32L432xC", "STM32L432KC"],
         "config": {