Samsung msm7x27: libaudio fixes

* Local modules need to use TARGET_BOARD_PLATFORM (msm7x27)
* Don't hardcode combo device support, set in BoardConfigCommon

Thanks to AndroidMeda (changes kanged from p500's libaudio)

Change-Id: I8f28c015be942f59c6c9c09577b9379cdbb4eb02
remove double FM radio

Change-Id: I1bb951c91e717cc36e5019cc02d5231eadafdad2