soc: fsl: cpm1: qmc: Re-order probe() operations

soc: fsl: cpm1: qmc: Re-order probe() operations

Current code handles CPM1 version of QMC. In the QUICC Engine (QE)
version, some operations done at probe() need to be done in a different
order.

In order to prepare the support for the QE version, changed the sequence
of operation done at probe():
- Retrieve the tsa_serial earlier, before initializing resources.
- Group SCC initialisation and do this initialization when it is really
  needed in the probe() sequence.

Having the QE compatible sequence in the CPM1 version does not lead to
any issue and works correctly without any regressions.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20240808071132.149251-26-herve.codina@bootlin.com
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>