i2c: i2c-mux-pca954x: convert to use an explicit i2c mux core
Allocate an explicit i2c mux core to handle parent and child adapters etc. Update the select/deselect ops to be in terms of the i2c mux core instead of the child adapter. Add a mask to handle the case where not all child adapters should cause a mux deselect to happen, now that there is a common deselect op for all child adapters. Signed-off-by: NPeter Rosin <peda@axentia.se> Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
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