clang-format: add IndentExternBlock setting

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I7cb11f19333775f3912f98a3a8bfd6559601fabc

style: Add clang-format file for C code

This is based on libmctp and obmc-console's .clang-format with updates
for clang-16.

Change-Id: I56535f1289fec55c3ce2b8c98ccc7e4904a62b75
Signed-off-by: Andr

style: Add clang-format file for C code

This is based on libmctp and obmc-console's .clang-format with updates
for clang-16.

Change-Id: I56535f1289fec55c3ce2b8c98ccc7e4904a62b75
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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