MLBEDSW-10367: Fix assert in AreaFit

 - AreaFit failed to find a shape for a small aspect ratio. The
adjustment ratio step was too small and the retry counter
caused the iteration to break before finding a solution
 - The fix is to increase the allowed number of iterations and
as a last resort change the scaling ratio

Change-Id: Ic07e1cc60beae592dc832c9e71706d87621b1219
Signed-off-by: Johan Alfvén <johan.alfven@arm.com>