cpupower: Don't fetch maximum latency when EPP is enabled

cpupower: Don't fetch maximum latency when EPP is enabled

When EPP has been enabled the hardware will autonomously change
frequencies on it's own and thus there is no latency with changing
from the kernel.

Avoid doing the maximum latency check when EPP is found. This will
apply to both amd-pstate and intel-pstate drivers.

Link: https://lore.kernel.org/r/20241218191144.3440854-7-superm1@kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>