clang-ignore: rename

Currently openbmc-build-scripts will accept either .clang-ignore
or .clang-format-ignore. Meson by default looks at the
.clang-format-ignore name. Switch to using that one for

clang-ignore: rename

Currently openbmc-build-scripts will accept either .clang-ignore
or .clang-format-ignore. Meson by default looks at the
.clang-format-ignore name. Switch to using that one for broader
compatibility.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic215763d4197dc6d5f598737dbae902d4d23f44d

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