uboot-envtools: ath79: remove D-Link DIR-8x9 and DAP-1720 env config

The uboot-envtools can automatically parse the dts 'u-boot,env'
compatible string. So the env config file is now useless.

Signed-off-by: Shiji Yang <[email protected]>

package/boot/uboot-envtools/files/ath79

@@ -31,10 +31,6 @@ asus,zenwifi-cd6n|\
 asus,zenwifi-cd6r|\
 buffalo,bhr-4grv2|\
 devolo,magic-2-wifi|\
-dlink,dap-1720-a1|\
-dlink,dir-859-a1|\
-dlink,dir-859-a3|\
-dlink,dir-869-a1|\
 engenius,eap1200h|\
 engenius,eap1750h|\
 engenius,eap300-v2|\