hwmon: (pmbus/ltc2978) Add chip specific write_byte_data

Several of the manuals for devices supported by this driver describes
the need for a minimum wait time before the chip is ready to receive
next command.

This wait time is already implemented in the driver as a ltc_wait_ready
function with a driver defined wait time of 100 ms, and is considered
for specific devices before reading/writing data on the pmbus.

Since this driver uses the default pmbus_regulator_ops for the enable/
disable/is_enabled functions we should add a driver specific callback
for write_byte_data to prevent bypassing the wait time recommendations
for the following devices: ltc3880/ltc3882/ltc3883/ltc3884/ltc3886/
ltc3887/ltc3889/ltm4664/ltm4675/ltm4676/ltm4677/ltm4678/ltm4680/ltm4686/
ltm4700/ltc7880.

Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20220428144039.2464667-4-marten.lindahl@axis.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>