staging: comedi: addi_eeprom: cleanup v_EepromReadWord()

Add namespace to the function by renaming the CamelCase function to
addi_eeprom_readw().

Rename the CamelCase parameters and local variables.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>