[ARM] pxa: avoid polluting the kernel's namespace

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h.  Include this header file where necessary.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/net/irda/pxaficp_ir.c b/drivers/net/irda/pxaficp_ir.c
index c5b02b6..50b839d 100644
--- a/drivers/net/irda/pxaficp_ir.c
+++ b/drivers/net/irda/pxaficp_ir.c
@@ -24,6 +24,7 @@
 
 #include <asm/dma.h>
 #include <mach/irda.h>
+#include <mach/hardware.h>
 #include <mach/pxa-regs.h>
 
 #define IrSR_RXPL_NEG_IS_ZERO (1<<4)