clang-format: Allow short functions on a single line.

Before this change, clang-format only allows empty functions on a
single line. After this change, short functions on a single line is
also allowed. This aligns with the google3 style guide and does not
violate go/artstyle.

Bug: 181877164
Test: N/A
Change-Id: Icb5e2242d1f2fba8e065616d42ce8c30136a196b
1 file changed