i2c: mux: Use __i2c_transfer() instead of calling parent's master_xfer()

Newly introduced quirks infrastructure doesn't work for the devices behind
MUXes because MUX's master_xfer() calls parent's master_xfer() directly
without checking the quirks. Instead of duplicating check code in MUX just
call __i2c_transfer() instead. This has a side effect on tracing (messages
will appear on both MUX bus and parent bus), but maybe that's not bad at
the end.

Signed-off-by: Alexander Sverdlin <[email protected]>
Tested-by: Łukasz Gemborowski <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
Cc: [email protected]
Fixes: b7f625840267b1 ("i2c: add quirk checks to core")

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