Rename big-build option into standard-build.

With this change, the name is more descriptive and aligned with the targets
definitions in hal/targets.json.

tools/options.py

@@ -77,7 +77,7 @@ def get_default_options_parser(add_clean=True, add_options=True):
                                                                  'debug-info',
                                                                  'analyze',
 								 'small-build',
-								 'big-build'],
+								 'standard-build'],
                                                                 "build option"))
 
     return parser

tools/toolchains/gcc.py

@@ -273,7 +273,7 @@ class GCC_ARM(GCC):
         GCC.__init__(self, target, options, notify, macros, silent, TOOLCHAIN_PATHS['GCC_ARM'], extra_verbose=extra_verbose)
 
         # Use latest gcc nanolib
-        if "big-build" in self.options:
+        if "standard-build" in self.options:
             use_nano = False
         elif "small-build" in self.options:
             use_nano = True