qat: Drop extraneous parentheses from some macro values.

This header duplicates a few #defines in "adf_cfg_strings.h". The
latter header does not use the unneeded parentheses, but if a C file
includes both of these headers, clang raises an error because the macro
is redefined with a different value.

Reviewed by: markj
Sponsored by: DARPA
Obtained from: CheriBSD
Differential Revision: https://reviews.freebsd.org/D36329