ARM: OMAP4: wakeupgen: Fix the typo in AUXCOREBOOT register save

The wakeupgen context-save code reads AUXCOREBOOT0 register
instead of AUXCOREBOOT1 register contents while saving AUXCOREBOOT1.

Fix the same.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>