Remove dead code in math_brute_force (#1117)

* Remove dead code

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

* Remove tautological statements

PARALLEL_REFERENCE is unconditionally defined. Remove preprocessor
condition that always hold.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

* Remove unnecessary declarations

Also removed unused macro.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

* Format code

An unnecessary scope was removed. This formats the code using
clang-format.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>
8 files changed