ARM: OMAP4: wakeupgen: remove duplicate AUXCOREBOOT* read/write

The wakeupgen context-save code reads and stores the AUXCOREBOOT0 and
AUXCOREBOOT1 register contents twice.  This seems like a waste of
time, so, remove the duplicates.

Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>