usb: typec: mux: ps883x: Power the retimer off when not in use

usb: typec: mux: ps883x: Power the retimer off when not in use

When there's nothing going through the retimer, there's no reason to
keep it online. Put it in reset when possible to save power.

Also, remove the register cache-compare optimization as it makes little
sense now that the chip resets during almost all transitions and
tracking the validity of that cache becomes a headache.

Suggested-by: Jack Pham <jack.pham@oss.qualcomm.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Anthony Ruhier <aruhier@mailbox.org>
Link: https://patch.msgid.link/20260420-topic-ps883x_unused_reset-v1-1-7aabf7004d2a@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>