ARM: 8016/1: Check cpu id in pj4_cp0_init.

Check cpu id in pj4_cp0_init. So for no-PJ4 V7 cpus,
pj4_cpu0_init just return.
This fix will help to make the all the V7 cpus(PJ4 and no-PJ4)
can use code.
Signed-off-by: NChao Xie <chao.xie@marvell.com>
Reviewed-by: NKevin Hilman <khilman@linaro.org>
Tested-by: NKevin Hilman <khilman@linaro.org>
Tested-by: NStephen Warren <swarren@nvidia.com>
Reviewed-by: NStephen Warren <swarren@nvidia.com>
Tested-by: NMatt Porter <mporter@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/pj4-cp0.c

@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <asm/thread_notify.h>
+#include <asm/cputype.h>
 
 static int iwmmxt_do(struct notifier_block *self, unsigned long cmd, void *t)
 {
@@ -80,6 +81,9 @@ static int __init pj4_cp0_init(void)
 {
 	u32 cp_access;
 
+	if (!cpu_is_pj4())
+		return 0;
+
 	cp_access = pj4_cp_access_read() & ~0xf;
 	pj4_cp_access_write(cp_access);