bcm27xx: enable THERMAL_WRITABLE_TRIPS on bcm2710 and bcm2711

The PoE hat supported on the RPi 3B+ and 4B comes with a rather
loud fan, tripped in two steps by the brcmstb_thermal
thermal_zone driver.  Enabling writable trip points allow
users to adjust the fan trip points according to their
preferred temp/noise ratio.

This setting is enabled on most other targets with similar
thermal_zone controlled cooling devices.

Signed-off-by: Bjørn Mork <bjorn@mork.no>

target/linux/bcm27xx/bcm2710/config-4.19

@@ -542,6 +542,7 @@ CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
 CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
 CONFIG_THERMAL_GOV_STEP_WISE=y
 CONFIG_THERMAL_OF=y
+CONFIG_THERMAL_WRITABLE_TRIPS=y
 CONFIG_THREAD_INFO_IN_TASK=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y

target/linux/bcm27xx/bcm2710/config-5.4

@@ -575,6 +575,7 @@ CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
 CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
 CONFIG_THERMAL_GOV_STEP_WISE=y
 CONFIG_THERMAL_OF=y
+CONFIG_THERMAL_WRITABLE_TRIPS=y
 CONFIG_THREAD_INFO_IN_TASK=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y

target/linux/bcm27xx/bcm2711/config-4.19

@@ -551,6 +551,7 @@ CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
 CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
 CONFIG_THERMAL_GOV_STEP_WISE=y
 CONFIG_THERMAL_OF=y
+CONFIG_THERMAL_WRITABLE_TRIPS=y
 CONFIG_THREAD_INFO_IN_TASK=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y

target/linux/bcm27xx/bcm2711/config-5.4

@@ -585,6 +585,7 @@ CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
 CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
 CONFIG_THERMAL_GOV_STEP_WISE=y
 CONFIG_THERMAL_OF=y
+CONFIG_THERMAL_WRITABLE_TRIPS=y
 CONFIG_THREAD_INFO_IN_TASK=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y