Revert "tools: regions only if bootloader is supported"

This reverts commit d7e0012

Author: jeromecoutant

tools/toolchains/mbed_toolchain.py

@@ -895,10 +895,6 @@ def _add_all_regions(self, region_list, active_region_name):
     def add_regions(self):
         """Add regions to the build profile, if there are any.
         """
-
-        if not getattr(self.target, "bootloader_supported", False):
-            return
-
         if self.config.has_regions:
             try:
                 regions = list(self.config.regions)