jump_label: move 'asm goto' support test to Kconfig

Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label".

The jump label is controlled by HAVE_JUMP_LABEL, which is defined
like this:

  #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
  # define HAVE_JUMP_LABEL
  #endif

We can improve this by testing 'asm goto' support in Kconfig, then
make JUMP_LABEL depend on CC_HAS_ASM_GOTO.

Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will
match to the real kernel capability.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>

arch/xtensa/kernel/jump_label.c

@@ -10,8 +10,6 @@
 
 #include <asm/cacheflush.h>
 
-#ifdef HAVE_JUMP_LABEL
-
 #define J_OFFSET_MASK 0x0003ffff
 #define J_SIGN_MASK (~(J_OFFSET_MASK >> 1))
 
@@ -95,5 +93,3 @@ void arch_jump_label_transform(struct jump_entry *e,
 
 	patch_text(jump_entry_code(e), &insn, JUMP_LABEL_NOP_SIZE);
 }
-
-#endif /* HAVE_JUMP_LABEL */