ARM: OMAP5 / DRA7: Fix HYP mode boot for thumb2 build

'adr' yields a data-pointer, not a function-pointer.

Fixes: 999f934d ("ARM: omap5/dra7xx: Enable booting secondary
CPU in HYP mode")
Signed-off-by: Matthijs van Duin <matthijsvanduin@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>