scripts: genpinctrl: process all remap blocks

Only first remap block was being processed, take into account all of
them now. Note that ``FULL_REMAP`` has been adjusted to ``REMAP_FULL``
as it was wrong. Tests updated to cover multiple remap cases.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
4 files changed