Add PRCM partition, CM instance register address offset, and clockdomain
register address offset to each OMAP4 struct clockdomain record.  Add OMAP4
clockdomain code to use this new data to access registers properly.

While here, clean up some nearby clockdomain code to allocate auto variables
in my recollection of Linus's preferred style.

The autogeneration scripts have been updated.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Benoît Cousson <b-cousson@ti.com>
Tested-by: Rajendra Nayak <rnayak@ti.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>