turris1x-btrfs: deploy boot.scr and link the appropriate dtb name

There is now U-Boot's distroboot script available that can be used to
boot the system.

hardware/turris1x/turris1x-btrfs/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=turris1x-btrfs
-PKG_VERSION:=3.0.1
+PKG_VERSION:=3.1.0
 PKG_RELEASE:=1
 
 PKG_MAINTAINER:=CZ.NIC <packaging@turris.cz>

hardware/turris1x/turris1x-btrfs/files/kernel-install

@@ -19,3 +19,5 @@ deploy() {
 
 deploy zImage
 deploy fdt
+deploy turris1x.dtb
+deploy boot.scr