Verify on Intel Precesion 5750. CID: 202002-27723, with ubuntu 20.04.1.

1. add groovy-proposed source to /etc/apt/source.list
+deb http://archive.ubuntu.com/ubuntu/ groovy-proposed main restricted
2. $ sudo apt update
3. $ sudo apt install libasound2
4. Try to modify /usr/alsa/ucm2/codecs/rt711/init.conf
-cset "name='rt711 ADC 23 Mux' 'MIC2'"
+cset "name='rt711 ADC 23 Mux' 'LINE1'"
5. $ alsaucm set _boot ""
6. $ amixer contents
numid=54,iface=MIXER,name='rt711 ADC 23 Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=4
  ; Item #0 'MIC2'
  ; Item #1 'LINE1'
  ; Item #2 'LINE2'
  ; Item #3 'DMIC'
  : values=1
7. it shows that the rule can apply successfully

** Tags removed: verification-needed verification-needed-groovy
** Tags added: verification-done verification-done-groovy

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https://bugs.launchpad.net/bugs/1899857

Title:
  [SRU] alsa-lib: support the enum value settings both in "" and in ''

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