kernel/arm64: enable 8250 UART driver

Change-Id: If8195e5e1032a172b3365f8771c4d87a2f0657ad
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5191
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: <oliver.ruiz.dorantes@gmail.com>

arm64: Enable DTB handling, Introduce LINFlex UART driver

Change-Id: Ib643545271700e6ff4a4037d0e797355194927e7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5149
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: David Karoly <karolyd577@gmail.com>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>

arm64/debug_console: Add basic functionality to puts call

* Matches arm and riscv64

Change-Id: I88874df4da16f5019def0c0c79ca41f37a926c12
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4916
Reviewed-by: <karolyd577@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

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>