gbsim: i2s: Change configuration count to 20
gbsim: i2s: Change configuration count to 20

The firmware currently support 20 different I2S configurations
so change gbsim to contain 20 as well.

Signed-off-by: Mark A. Greer <2540a8c57225c2058d000de41debc8b502ea4a38@animalcreek.com>
Tested-by: John Stultz <33837adfb53316eae44aad04041e1240088d76fd@linaro.org>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@google.com>

projectara/gbsim,projectara/gbsim,bcousson/gbsim,gregkh/gbsim,gregkh/gbsim,bcousson/gbsim,bcousson/gbsim