fm: fix getting RDS text

for some reason java totally freaks out if you use a index outside the string
accoridng to java doc the last char of the string should be used in that case - SHOULD...

Change-Id: I98c95602a0a77673ffd0bb287c06afcea5d596c3
Merge "fm: fix getting RDS text" into cm-11.0
Merge branch 'cm-11.0' into kk_mkt