librem5-devkit: Only enable CSI parts needed for the camera

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
2 jobs for camera in 39 minutes and 44 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #42297
librem5
build:aarch64:Image

00:39:44

passed #42298
librem5
build:aarch64:deb

00:25:42