clang-format: Update to clang-format >= 6

We get new interesting formating with clang-format greater or equal to 6
as stated in the removed comments.  Miguel Ojeda suggested to even move
the minimal clang-format version to 11, which is the minimum LLVM
supported at the moment [1].

Automatically updated with:
sed -i 's/^\(\s*\)#\(\S*\s\+\S*\) # Unknown to clang-format.*/\1\2/' .clang-format

Link: https://lore.kernel.org/r/CANiq72nLOfmEt-CZBmm2ouEB_x6Jm9ggDVFCVJxYxKw7O0LTzQ@mail.gmail.com [1]
Cc: Miguel Ojeda <[email protected]>
Cc: Tom Rix <[email protected]>
Signed-off-by: Mickaël Salaün <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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