qualcommax: move ipq807x support to subtarget

Now that qualcommax exists as a target and dependencies have been updated
let move ipq807x support to subtarget of qualcommax.

This is mostly copy/paste with the exception of having to update SSDK and
NSS-DP to use CONFIG_TARGET_SUBTARGET.

This is a preparation for later addition of IPQ60xx and IPQ50xx support.

Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/qualcommax/ipq807x/base-files/etc/init.d/bootcount

@@ -0,0 +1,13 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+
+boot() {
+	case $(board_name) in
+	edgecore,eap102)
+		fw_setenv upgrade_available 0
+		# Unset changed flag after sysupgrade complete
+		fw_setenv changed
+	;;
+	esac
+}