ucm2: Improve devkit config

Use the mux to switch mics and properly configure defaults and
detect headphone jack.
3 jobs for devkit-ucm in 6 minutes and 20 seconds (queued for 19 minutes and 1 second)
Status Job ID Name Coverage
  Package
passed #328081
librem5
package:deb-debian

00:01:12

 
  Test Package
passed #328082
librem5
autopkgtest-debian-package

00:05:08

passed #328083
librem5
lintian-debian-package

00:00:47