I just got a Dell Inspiron 7352 i7-5500u Broadwell HD5500 1920×1080 2-1 laptop for my daughter. Turned it into a MacBook Air and it worked perfectly with El Capitan, Yosemite and macOS Sierra. It has Realtek ALC255 sound card. This is how to patch AppleHDA.
1. Use original AppleHDA.kext and AppleALC released version installed to /System/Library/Extensions . Repair permissions and update cache.
sudo touch /System/Library/Extensions
sudo kextcache -update-volume /
2. Patch DSDT with audio layout 13 = 0D and change B0D3 to HDAU with layout id 13 = 0D (for other graphics card use different layout from audio and inject in Clover for HDMI).
3. Inject Audio layout 13 into Clover config.plist and patch the HDMI with Rehabman patches for the correct -ig-platform-id.
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