I understand its not supported but i've looked though the the INF file (cs4208_09.inf) for driver installation it does show how the INF file looks for x86 drivers
; Copyright 2012-2013, Cirrus Logic, Inc.
[Version]
Signature="$Windows NT$"
Class=MEDIA
ClassGUID={4d36e96c-e325-11ce-bfc1-08002be10318}
Provider=%ProviderName%
CatalogFile=CS4208.cat
;CatalogFile.ntx86=CS420x86.cat
;CatalogFile.ntamd64=CS420x64.cat
DriverVer=%DriverBuildDate%,%DriverBuildVer%
[SourceDisksNames]
222=%DiskDescription%,,,
[SourceDisksFiles.x86]
CSLFD.sys=222,\x86
CSUFD.sys=222,\x86
CLFiltAPO.dll=222,\x86
CLLoopAPO.dll=222,\x86
WdfCoInstaller01011.dll=222,\x86
[SourceDisksFiles.amd64]
CSLFD.sys=222,\x64
CSUFD.sys=222,\x64
CLFiltAPO.dll=222,\x64
CLLoopAPO.dll=222,\x64
WdfCoInstaller01011.dll=222,\x64
[DestinationDirs]
CSxFD.CopyList=12 ; DIRID_DRIVERS = %windir%\system32\Drivers
CLFiltAPO.CopyList=11 ; DIRID_SYSTEM = %windir%\system32
CLLoopAPO.CopyList=11 ; DIRID_SYSTEM = %windir%\system32
WdfCoInstaller.CopyList=11 ; DIRID_SYSTEM = %windir%\system32