staging: comedi: das08: rename DAS08JR_AO_LSB() and DAS08JR_AO_MSB()
The `DAS08JR_AO_LSB(x)` macro returns the offset to the analog output
low byte register for channel x (0 or 1) for "JR" boards with analog
output support. The `DAS08JR_AO_MSB(x)` macro returns the offset to the
corresponding high byte register. Rename the macros to
`DAS08JR_AO_LSB_REG(x)` and `DAS08JR_AO_MSB_REG(x)` respectively, and
add some comments.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>