FUTURE_SEQUANA: reuse supported_toolchains from TARGET_PSOC6

Author: hennadiykytsun

targets/targets.json

@@ -8345,7 +8345,6 @@
     },
     "FUTURE_SEQUANA_M0": {
         "inherits": ["MCU_PSOC6_M0"],
-        "supported_toolchains": ["GCC_ARM", "ARM", "IAR"],
         "supported_form_factors": ["ARDUINO"],
         "extra_labels_add": ["PSOC6_FUTURE", "CY8C63XX", "FUTURE_SEQUANA"],
         "extra_labels_remove": ["PSOC6"],
@@ -8375,7 +8374,6 @@
     },
     "FUTURE_SEQUANA": {
         "inherits": ["MCU_PSOC6_M4"],
-        "supported_toolchains": ["GCC_ARM", "ARM", "IAR"],
         "supported_form_factors": ["ARDUINO"],
         "extra_labels_add": ["PSOC6_FUTURE", "CY8C63XX", "CORDIO"],
         "extra_labels_remove": ["PSOC6"],