machine: [imx6]: mark phyBOARD-ALCOR i.MX6 as discontinued
machine: [imx6]: mark phyBOARD-ALCOR i.MX6 as discontinued

The product phyBOARD-ALCOR i.MX6 is set to end of life.

Signed-off-by: Stefan Christ <c04781dbce194802ec6a6311a1200fbcd0141e96@phytec.de>

PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec