xtensa: move XCHAL_KIO_* definitions to kmem_layout.h

[ Upstream commit 6591685d ]

These address and size definitions define xtensa kernel memory layout,
move them from vectors.h to the kmem_layout.h

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>