Find7: update media configs

Import mixer paths config from 1+1 with additional edits by Omni
Find7: cleanup the hax

Credit to Omni for the fstab file
Find7: update cpu performance settings from hammerhead
Find7: link wcd audio firmware at install time

Thanks Omni!
Find7: fixup sdcard permissions via fstab
Find7: usb storage is not emulated
Find7: use prebuilt GPS HAL
Find7: f7 and f7a have msm8974pro SoCs