clang-format: add configuration file

Adds a configuration file to be used with clang-format. This file was
copied from the Linux kernel, but with the ForEachMacros updated for
OP-TEE.

Clang-format

clang-format: add configuration file

Adds a configuration file to be used with clang-format. This file was
copied from the Linux kernel, but with the ForEachMacros updated for
OP-TEE.

Clang-format can help with formatting the code, but we are not
expecting follow it to the letter.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Clement Faure <clement.faure@nxp.com>

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