ARM: bcm2835: Fix names for the Raspberry Pi GPIO lines

There are some differences between the schematics and the official firmware
DTS [1]. So based on these additional information the following has been
changed:

* use consistent "CAM_GPIO1" for camera LED
* use consistent "CAM_GPIO0" for camera shutdown
* add "USB_LIMIT" for USB current limit (0=600mA, 1=1200mA)

[1] - https://github.com/raspberrypi/firmware/blob/master/extra/dt-blob.dts

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

arch/arm/boot/dts/bcm2835-rpi-b.dts

@@ -30,7 +30,7 @@
 			  "SDA1",
 			  "SCL1",
 			  "GPIO_GCLK",
-			  "CAM_CLK",
+			  "CAM_GPIO1",
 			  "LAN_RUN",
 			  "SPI_CE1_N",
 			  "SPI_CE0_N",
@@ -53,7 +53,7 @@
 			  "GPIO24",
 			  "GPIO25",
 			  "NC", /* GPIO26 */
-			  "CAM_GPIO",
+			  "CAM_GPIO0",
 			  /* Binary number representing build/revision */
 			  "CONFIG0",
 			  "CONFIG1",