ARM: 7043/1: mach-ixp2000: rename GPIO header

The ixp2000 abuses the <mach/gpio.h> namespace by not implementing
any generic GPIO nor gpiolib functions in it - just custom GPIO.
Rename the header to <mach/gpio-ixp2000.h> for clarity.

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-ixp2000/core.c b/arch/arm/mach-ixp2000/core.c
index e95c5e7..59a5126 100644
--- a/arch/arm/mach-ixp2000/core.c
+++ b/arch/arm/mach-ixp2000/core.c
@@ -39,6 +39,8 @@
 #include <asm/mach/time.h>
 #include <asm/mach/irq.h>
 
+#include <mach/gpio-ixp2000.h>
+
 static DEFINE_SPINLOCK(ixp2000_slowport_lock);
 static unsigned long ixp2000_slowport_irq_flags;