xtensa: add missing XCHAL_HAVE_WINDOWED check

Add missing preprocessor conditions to secondary reset vector code.

Fixes: 09af39f6 ("xtensa: use register window specific opcodes only when present")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/kernel/mxhead.S

@@ -37,11 +37,13 @@ _SetupOCD:
 	 * xt-gdb to single step via DEBUG exceptions received directly
 	 * by ocd.
 	 */
+#if XCHAL_HAVE_WINDOWED
 	movi	a1, 1
 	movi	a0, 0
 	wsr	a1, windowstart
 	wsr	a0, windowbase
 	rsync
+#endif
 
 	movi	a1, LOCKLEVEL
 	wsr	a1, ps