arm64: Map discovered UART into kernel space as device memory.

Change-Id: I4af09410c29c5586b85e1e1eba5803c0b30a1b01
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5272
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

arm64: MMU WIP.

Change-Id: I19b2b9617fcb7bc047f9bea156801ec78786532e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5261
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

arm64: Add stubs so kernel can at least link

Signed-off-by: Jaroslaw Pelczar <jarek@jpelczar.com>
Change-Id: I2476a6346c912c4aa0c26e4f3720ea2c2690b669
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1857
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>