xtensa: fix unaligned usermode access

- correct use of .config #define name;
CONFIG_UNALIGNED_USER ---> CONFIG_XTENSA_UNALIGNED_USER

Signed-off-by: Max Filippov <[e-mail]>
Signed-off-by: Pete Delaney <[e-mail]>
Signed-off-by: Chris Zankel <[e-mail]>

arch/xtensa/kernel/traps.c

···
 /* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */
 /* EXCCAUSE_PRIVILEGED unhandled */
 #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
-#ifdef CONFIG_UNALIGNED_USER
+#ifdef CONFIG_XTENSA_UNALIGNED_USER
 { EXCCAUSE_UNALIGNED,		USER,	   fast_unaligned },
 #else
 { EXCCAUSE_UNALIGNED,		0,	   do_unaligned_user },
···
  */
 
 #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
-#ifndef CONFIG_UNALIGNED_USER
+#ifndef CONFIG_XTENSA_UNALIGNED_USER
 void
 do_unaligned_user (struct pt_regs *regs)
 {