Now that all in-tree boards have been converted to the compatible strings from Linux, delete the support for the ad-hoc "pcf2127-rtc" one. Cc: Simon Glass <sjg@chromium.org> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Michael Walle <michael@walle.cc> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>