netbase: put sys940x specific interfaces file in MACHINE directory

Move the interfaces file to a MACHINE appropriate subdirectory of
files so that:
a) base.bbclass appropriately marks the resultant package MACHINE
   specific.
b) builds for alternative MACHINES whilst this layer is enabled
   don't get the sys940x interfaces file

Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

meta-sys940x/recipes-core/netbase/files/sys940x/interfaces

@@ -0,0 +1,10 @@
+# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
+
+# The loopback interface
+auto lo
+iface lo inet loopback
+
+# Wired or wireless interfaces
+auto eth0
+iface eth0 inet dhcp
+    hwaddress ether RANDOM_MAC

meta-sys940x/recipes-core/netbase/netbase_4.47.bbappend

@@ -1,3 +1,3 @@
 FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
 RDEPENDS_${PN} += "genmac"
-PRINC := "${@int(PRINC) + 1}"
+PRINC := "${@int(PRINC) + 2}"