Updating AGL feature

Updating AGL feature

Updating AGL feature list to match with git listed features and adding
link to the git feature repository. Not adding the descriptions for some
of some features as readme files of those feature are not updated.

Bug-AGL: [SPEC-1902]
Signed-off-by: Vinod Ahuja <vahuja@unomaha.edu>
Change-Id: Ib2f74868b417b49d09193341a1ab1e44e412c375
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/28624
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>