DaVinci: rename setup_usb() to davinci_setup_usb()

Rename setup_usb() into davinci_setup_usb().  While at it:

- move its declaration from <mach/common.h> to more fitting <mach/usb.h>;
- teach it to handle values of the 'mA' parameter greater than 510 and thus
  pass 1000 instead of 500 for the power switches capable of sourcing over 1 A;
- teach it to handle odd values of the 'potpgt_ms' parameter...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/board-dm355-leopard.c

@@ -24,11 +24,11 @@
 #include <asm/mach/arch.h>
 
 #include <mach/dm355.h>
-#include <mach/common.h>
 #include <mach/i2c.h>
 #include <mach/serial.h>
 #include <mach/nand.h>
 #include <mach/mmc.h>
+#include <mach/usb.h>
 
 #define DAVINCI_ASYNC_EMIF_CONTROL_BASE		0x01e10000
 #define DAVINCI_ASYNC_EMIF_DATA_CE0_BASE	0x02000000
@@ -263,7 +263,7 @@ static __init void dm355_leopard_init(void)
 	gpio_request(2, "usb_id_toggle");
 	gpio_direction_output(2, USB_ID_VALUE);
 	/* irlml6401 switches over 1A in under 8 msec */
-	setup_usb(500, 8);
+	davinci_setup_usb(1000, 8);
 
 	davinci_setup_mmc(0, &dm355leopard_mmc_config);
 	davinci_setup_mmc(1, &dm355leopard_mmc_config);