rename config.txt file to diya-config.txt to avoid conflict wuth rpi

recipes-diya/diya-overlay/files/boot-to-recovery

@@ -7,15 +7,15 @@ fi
 
 . /etc/profile
 
-if [ ! -e /boot/config.txt ]; then
+if [ ! -e /boot/diya-config.txt ]; then
     # prepare env for recovery boot
-    cat << EOF > /boot/config.txt
+    cat << EOF > /boot/diya-config.txt
 recovery=true
 recovery_image=recovery-${MACHINE}.cpio.gz
 EOF
 else
-    sed -i 's/^.*recovery.*/recovery=true/g' /boot/config.txt || \
-                echo "recovery=true" >> /boot/config.txt
+    sed -i 's/^.*recovery.*/recovery=true/g' /boot/diya-config.txt || \
+                echo "recovery=true" >> /boot/diya-config.txt
 fi
 echo "Rebooting to recovery mode"
 reboot