dt-bindings: arc: convert archs-pct.txt to yaml

Convert dt-binding archs-pct from txt to yaml format.

Signed-off-by: Aryabhatta Dey <aryabhattadey35@gmail.com>
Link: https://lore.kernel.org/r/emosjjbdwimwevrf2ew2dpn5sdx254el5fanhhquouu4bz6nbe@zqyp5ra7bmhh


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>