soc: fsl: cpm1: qmc: Introduce functions to get a channel from a phandle list

qmc_chan_get_byphandle() and the resource managed version retrieve a
channel from a simple phandle.

Extend the API and introduce qmc_chan_get_byphandles_index() and the
resource managed version in order to retrieve a channel from a phandle
list using the provided index to identify the phandle in the list.

Also update qmc_chan_get_byphandle() and the resource managed version to
use qmc_chan_get_byphandles_index() and so avoid code duplication.

Signed-off-by: Herve Codina <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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