Add .clang-tidy

Having .clang-tidy file will give us a 'clang-tidy' meson build target,
so doing a full clang-tidy run can be done just by:

ninja -C build clang-tidy

I did not look at if more checks should be enabled or not. I disabled
clang-diagnostic-c99-designator as that feature was used in the code,
and I see no harm with the feature.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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