libfmjni: Improve and fix FM jni logs

 * Log cur_fm_state as Debug instead of Error
 * Log successful and state logs as Debug and Info instead of Error
 * Log step by step firmware download as Info and Debug
 * Fix logging of the is_rds_support
 * Add __func__ name for the cur_fm_state logs
 * Add a cur_fm_state log for Stop_Scan_Seek
 * Add missing LOG_TAG for all sources using ALOG*
 * Avoid double log on error in IsRdsSupport
 * Fix typos, relevant warnings and cleanup related sources

Change-Id: I2abe77c6f00c02ef106b569bef5db6b366e76df1
7 files changed