* Rework the device initialization function so as to read the
"Multi-Function Pin Control" register (0x58) once instead of twice.
I2C transactions aren't cheap so this speeds up the driver loading.

* Only create the "vrm" attribute if at least one VID value is
available.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Cc: Gong Jun <jgong@winbond.com>
Acked-by: NRudolf Marek <r.marek@assembler.cz>
Signed-off-by: NMark M. Hoffman <mhoffman@lightlink.com>