dt-bindings: soc: fsl: cpm_qe: Add TSA controller

Add support for the time slot assigner (TSA)
available in some PowerQUICC SoC such as MPC885
or MPC866.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20230217145645.1768659-2-herve.codina@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>