clover: typo fix PIPE_COMPUTE_MAX_CLOCK_FREQUENCY

Since 6a664f2327764206f96471b629652a8f0183c962 we couldn't build,
because we defined PIPE_COMPUTE_CAP_MAX_CLOCK_FREQUENCY instead of
PIPE_COMPUTE_MAX_CLOCK_FREQUENCY.

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>