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
Signed-off-by: Robert Marko <[email protected]>

target/linux/mvebu/config-6.12

@@ -88,7 +88,7 @@ CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
 CONFIG_CPU_FREQ_STAT=y
 CONFIG_CPU_HAS_ASID=y
 CONFIG_CPU_IDLE=y
-CONFIG_CPU_IDLE_GOV_LADDER=y
+CONFIG_CPU_IDLE_GOV_MENU=y
 CONFIG_CPU_MITIGATIONS=y
 CONFIG_CPU_PABRT_V7=y
 CONFIG_CPU_PJ4B=y
@@ -213,7 +213,6 @@ CONFIG_HWBM=y
 CONFIG_HWMON=y
 CONFIG_HW_RANDOM=y
 CONFIG_HZ_FIXED=0
-CONFIG_HZ_PERIODIC=y
 CONFIG_I2C=y
 CONFIG_I2C_BOARDINFO=y
 CONFIG_I2C_CHARDEV=y
@@ -298,6 +297,8 @@ CONFIG_NET_SELFTESTS=y
 CONFIG_NET_XGRESS=y
 CONFIG_NLS=y
 CONFIG_NOP_USB_XCEIV=y
+CONFIG_NO_HZ_COMMON=y
+CONFIG_NO_HZ_IDLE=y
 CONFIG_NR_CPUS=4
 CONFIG_NVMEM=y
 CONFIG_NVMEM_LAYOUTS=y