cpufreq: mediatek-hw: Fix cpufreq_table_find_index_dl() call

The new cpufreq table flag RELATION_E introduced a new "efficient"
parameter for the cpufreq_table_find*() functions.

Fixes: 1f39fa0d (cpufreq: Introducing CPUFREQ_RELATION_E)
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>