libs/wlgen/rta: fix calibration configuration using FIFO:0 by default
libs/wlgen/rta: fix calibration configuration using FIFO:0 by default

The configuration of ulimits for RT tasks could limit, on some systems,
the creation of RT tasks with a max priority of 0.
For calibration proposes this value could be in general acceptable.

TODO: we should read from target what is the maximum RT prio which can
be require, using "ultimi -Hr" and use that value to configure the
priority for the RT-App.

Signed-off-by: Patrick Bellasi <431c86f368affbc3148c4669fbd465131f7e82cb@arm.com>

credp/lisa,arnoldlu/lisa,bjackman/lisa,ARM-software/lisa,ARM-software/lisa,JaviMerino/lisa,credp/lisa,mdigiorgio/lisa,ARM-software/lisa,mdigiorgio/lisa,bjackman/lisa,credp/lisa,joelagnel/lisa,joelagnel/lisa,credp/lisa,ARM-software/lisa,arnoldlu/lisa