hikey-kernel: Update kernel prebuilt with USB audio support (664e6d0)
am: e9f9477d3c

* commit 'e9f9477d3cd78eadc47052a751e1c785e4154a85':
  hikey-kernel: Update kernel prebuilt with USB audio support (664e6d0)

Change-Id: Ib86381f854b4f4cd305ac1a26b5f686e79b2997a