[POWERPC] Move reg_booke.h to include/asm-powerpc

This patch moves a copy of reg_booke.h to include/asm-powerpc and fixes
up the ifdef protection.
Signed-off-by: NBecky Bruce <becky.bruce@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>