implement TLS for arm64

Use the EL0 Read-Only Software Thread ID Register aka TPIDRRO_EL0
to store TLS pointer.

The EL0 Read-Only Software Thread ID Register is read-only in User mode
and read/write in privileged modes.

Change-Id: Idea7e3d66cd391dbbe3f9395cb37716089a49e13
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5673
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Reviewed-by: David Karoly <karolyd577@gmail.com>

arm64: Add more random scripts to get stuff to compile

Signed-off-by: Jaroslaw Pelczar <jarek@jpelczar.com>
Change-Id: Ie043af5b7471f626a1ffe100848151c832dcc439
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1853
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>