radio: iris: Fixed an issue with search stations list

Due to improper boundary checks, RDS search and search
station list were getting excluded.
Fixed the boundary check to include RDS seach and search
station list.

Change-Id: Ia2d7cc8a1bbf8e861a0e23dfc8ca56181b42b810
CRs-fixed: 597996
Signed-off-by: Satish Kodishala <skodisha@codeaurora.org>