dt-bindings: clock: ti: Convert fixed-factor-clock to yaml

dt-bindings: clock: ti: Convert fixed-factor-clock to yaml

This uses the ti,autoidle.yaml for clock autoidle support. Clean up the example
to meet the current standards.

Add the creator of the original binding as a maintainer.

Signed-off-by: Sukrut Bellary <sbellary@baylibre.com>
Link: https://lore.kernel.org/r/20250516081612.767559-3-sbellary@baylibre.com
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>