[U-Boot] scripts/Makefile.extrawarn: Silence more DTC warnings

[Tom Rini]

On Fri, Mar 22, 2019 at 09:47:39AM -0400, Tom Rini wrote:

> While our "extrawarns" logic has gotten out of sync with upstream
> Kbuild, for now lets start by bringing in the latest set of DTC_FLAGS
> from the Linux Kernel 5.0 to match their behavior in silencing warnings
> from dtc.
> 
> Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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