The parameters directive allows to almost automatically generate the
parameters table.
It allows to add rich descriptions to the parameters, such as references,
while checking if they exist in the *_hw.tcl file a obtaining the types
and default values.
However, it cannot obtain parameters generated from a foreach loop yet,
making it incompatible with the axi_dmac_hw.tcl file for example.
This commit also joins the other extensions into a single adi_links
extension.
Signed-off-by: Jorge Marques <jorge.marques@analog.com>