mvebu: enable tickless idle
Switch to NO_HZ_IDLE for energy saving. Also enable Menu cpuidle
governor for tickless systems.
Run-tested: Linksys WRT1900AC v2
Signed-off-by: Qingfang Deng <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/21136
(cherry picked from commit c13f299918702799e883fc330521bed4b7da0bd3)
Link: https://github.com/openwrt/openwrt/pull/21305
Signed-off-by: Robert Marko <[email protected]>
Qingfang Deng