[ARM] pxa: separate definitions from pxa-regs.h and remove it finally

The remaining registers are separated into:

   - <mach/regs-ost.h>
   - <mach/regs-rtc.h>
   - <mach/regs-intc.h>

and then we can remove pxa-regs.h completely. Instead of #include this
file, let's:

1. include the specific <mach/regs-*.h> with care (if that's absolutely
   necessary)

2. define the registers in the driver, make cleanly defined API to expose
   the register access to external with sufficient reason

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/drivers/net/irda/pxaficp_ir.c b/drivers/net/irda/pxaficp_ir.c
index 31794c2..e775338 100644
--- a/drivers/net/irda/pxaficp_ir.c
+++ b/drivers/net/irda/pxaficp_ir.c
@@ -24,9 +24,8 @@
 
 #include <mach/dma.h>
 #include <mach/irda.h>
-#include <mach/hardware.h>
-#include <mach/pxa-regs.h>
 #include <mach/regs-uart.h>
+#include <mach/regs-ost.h>
 
 #define FICP		__REG(0x40800000)  /* Start of FICP area */
 #define ICCR0		__REG(0x40800000)  /* ICP Control Register 0 */