toolchain: gcc: Remove ref. to undefined sym. CONFIG_ISA_ARM

This Kconfig symbol was removed in commit cb04620 ("remove make/
directory").

Signed-off-by: Ulf Magnusson <[email protected]>

Author: ulfalizer

include/toolchain/gcc.h

@@ -180,11 +180,6 @@ A##a:
 #define FUNC_CODE() .thumb;
 #define FUNC_INSTR(a)
 
-#elif defined(CONFIG_ISA_ARM)
-
-#define FUNC_CODE() .code 32;
-#define FUNC_INSTR(a)
-
 #else
 
 #error unknown instruction set