BCM2835 auxiliary peripheral clocks.

[Eric Anholt]

This is a followup to the main audio domain clocks series I just
posted.  There's a clock gate register controlling the clocks for a
few extra peripherals, and Martin Sperl has been working on the SPI
driver for 2/3 of them (the other is a simple UART).  This gives those
drivers the clock gate enable they need to access their registers.

The full series is available for testing at:

https://github.com/anholt/linux/tree/bcm2385-clock-aux