[ARM] pxa: fix incorrect initialization of mfp sysdev when not pxa2xx

The initialization of mfp sysdev in pxa2xx_mfp_init() shall really be
avoided when !cpu_is_pxa2xx().

Signed-off-by: Eric Miao <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/mach-pxa/mfp-pxa2xx.c

···
 {
 	int i;
 
+	if (!cpu_is_pxa2xx())
+		return 0;
+
 	if (cpu_is_pxa25x())
 		pxa25x_mfp_init();