Merge tag 'fsl_qmc_tsa_v6.8' of https://github.com//hcodina/linux into soc/drivers

PowerQUICC QMC and TSA drivers updates for v6.8

This pull request contains updates to prepare the support for the QMC
HDLC driver.
        - Perform some fixes
        - Add support for child devices
        - Add QMC dynamic timeslot support

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>