i2c: i2c-mux-pca954x: fix deselect enabling for device-tree

i2c: i2c-mux-pca954x: fix deselect enabling for device-tree

Deselect functionality can be ignored for device-trees with
"i2c-mux-idle-disconnect" entries if no platform_data is available.
By enabling the deselect functionality outside the platform_data
block the logic works as it did in previous kernels.

Fixes: 7fcac9807175 ("i2c: i2c-mux-pca954x: convert to use an explicit i2c mux core")
Cc: <[email protected]> # v4.7+
Signed-off-by: Alex Hemme <[email protected]>
Signed-off-by: Ziyang Wu <[email protected]>
[touched up a few minor issues /peda]
Signed-off-by: Peter Rosin <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>