Makefile: unexport 'DEVICE_TREE' environment variable
U-Boot looks for the environment variable DEVICE_TREE and uses its value if set instead of the CONFIG_DEFAULT_DEVICE_TREE configuration option since v2021.01, more specifically commit c0f1ebe9c1b9745e (binman: Allow selecting default FIT configuration) - So unexport it like we do for other "troublesome" environment variables to ensure consistent behaviour. Reported-by: Neal Frager <nealf@xilinx.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
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