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 Name Job ID Coverage
  Build
passed build:aarch64:Image #42297
librem5

00:39:44

passed build:aarch64:deb #42298
librem5

00:25:42