ARM: 7774/1: Fix dtb dependency to use order-only prerequisites
The %.dtb dependency is specified to depend on the PHONY "scripts". That means that it'll build every time even if the underlying dtb file hasn't been touched. Use an order-only prerequisites to fix this. Also mark "dtbs" as PHONY for correctness. This was broken in (70b0476a ARM: 7513/1: Make sure dtc is built before running it). Reported-by: NMike Frysinger <vapier@gentoo.org> Signed-off-by: NDoug Anderson <dianders@chromium.org> Acked-by: NOlof Johansson <olof@lixom.net> Reviewed-by: NDavid Brown <davidb@codeaurora.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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