Fix recent pxa270 serial breakage

This fixes a copy/paste bug introduced in commit
2d48377a85 that pushed TARGET_WORDS_BIGENDIAN
dependency to board level.

Signed-off-by: Lars Munch <lars@segv.dk>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/pxa2xx.c

@@ -2084,7 +2084,7 @@ PXA2xxState *pxa270_init(unsigned int sdram_size, const char *revision)
 #else
             serial_mm_init(pxa270_serial[i].io_base, 2,
                            s->pic[pxa270_serial[i].irqn], 14857000/16,
-                           serial_hds[i], 1, 1);
+                           serial_hds[i], 1, 0);
 #endif
         else
             break;