plugins/scpi: minor spelling fixes

Signed-off-by: Tim Harder <timothy.harder@analog.com>
plugins/scpi: add an ini method to save the current dBm on the generator

Signed-off-by: Tim Harder <timothy.harder@analog.com>
plugins/scpi: add an ini method to support seeking to a given magnitude

Signed-off-by: Tim Harder <timothy.harder@analog.com>
profiles: add initial adc2 test profile

Signed-off-by: Tim Harder <timothy.harder@analog.com>