[cmake] allow configuring OPENTHREAD_CONFIG_MAC_CSL_REQUEST_AHEAD_US

with CMake option.

This makes it easier for vendors to tweak scheduling CSL
transmission request depending on minimum time to process it
(which for example might be higher for RCP architecture).

Signed-off-by: Maciej Baczmanski <maciej.baczmanski@nordicsemi.no>

Author: maciejbaczmanski

etc/cmake/options.cmake

@@ -328,6 +328,7 @@ ot_string_option(OT_VENDOR_SW_VERSION OPENTHREAD_CONFIG_NET_DIAG_VENDOR_SW_VERSI
 set(OT_POWER_SUPPLY_VALUES "BATTERY" "EXTERNAL" "EXTERNAL_STABLE" "EXTERNAL_UNSTABLE")
 ot_multi_option(OT_POWER_SUPPLY OT_POWER_SUPPLY_VALUES OPENTHREAD_CONFIG_DEVICE_POWER_SUPPLY OT_POWER_SUPPLY_ "set the device power supply config")
 
+ot_int_option(OT_MAC_CSL_REQUEST_AHEAD_US OPENTHREAD_CONFIG_MAC_CSL_REQUEST_AHEAD_US "set time ahead to deliver CSL frame from MAC to SubMac in microseconds")
 ot_int_option(OT_MLE_MAX_CHILDREN OPENTHREAD_CONFIG_MLE_MAX_CHILDREN "set maximum number of children")
 ot_int_option(OT_RCP_RESTORATION_MAX_COUNT OPENTHREAD_SPINEL_CONFIG_RCP_RESTORATION_MAX_COUNT "set max RCP restoration count")
 ot_int_option(OT_RCP_TX_WAIT_TIME_SECS OPENTHREAD_SPINEL_CONFIG_RCP_TX_WAIT_TIME_SECS "set RCP TX wait TIME in seconds")