Dlink DIR868L: fix USB Power supply in some cases (cfe/board_data dep…

…endency)

Note: next one ... see also
https://bitbucket.org/pedro311/freshtomato-arm/commits/8c07c7a7ad048bb20e4df9135050245de31dd6d2

see report:
https://www.linksysinfo.org/index.php?threads/usb-port-issue-after-upgrade-netgear-r6400v1.77564/#post-337624

release/src-rt-6.x.4708/router/rc/init.c

@@ -7371,6 +7371,9 @@ static int init_nvram(void)
 			nvram_set("ehci_ports", "2-1 2-2");
 			nvram_set("ohci_ports", "3-1 3-2");
 
+			/* enable usbX power supply by default */
+			nvram_set("gpio10", "usbport2"); /* Ex.: this config is correct for DIR868L */
+
 			/* misc settings */
 			nvram_set("boot_wait", "on");
 			nvram_set("wait_time", "3");