Add support to Objective-C to Zephyr.

Signed-off-by: Rodrigo Peixoto <rodrigopex@gmail.com>

Author: rodrigopex

configs/common.config

@@ -17,6 +17,7 @@ CT_GCC_SRC_CUSTOM=y
 CT_GCC_CUSTOM_LOCATION="${GITHUB_WORKSPACE}/gcc"
 CT_CC_GCC_EXTRA_CONFIG_ARRAY="--with-gnu-ld --with-gnu-as --enable-initfini-array"
 CT_CC_LANG_CXX=y
+CT_CC_LANG_OBJC=y
 
 # Newlib
 CT_NEWLIB_SRC_CUSTOM=y