Merge "RaspberryPi Device Tree changes due for v4.2" from Lee Jones:
* tag 'rpi-dt-for-armsoc-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rpi/linux-rpi:
ARM: bcm2835: dt: Use 0x4 prefix for DMA bus addresses to SDRAM.
ARM: bcm2835: dt: Add the mailbox to the device tree
ARM: bcm2835: dt: Fix i2c0 node name
ARM: bcm2835: dt: Use pinctrl header
ARM: bcm2835: dt: Add header file for pinctrl constants
ARM: bcm2835: dt: Add root properties for Raspberry Pi
ARM: bcm2835: dt: Add vendor prefix for Raspberry Pi
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