fix(boards.txt): rename recipe

Author: fpistm

boards.txt

@@ -6588,7 +6588,7 @@ LoRa.menu.pnum.ACSIP_S76S.build.product_line=STM32L073xx
 LoRa.menu.pnum.ACSIP_S76S.build.variant=STM32L0xx/L072R(B-Z)T_L073R(B-Z)T_L083R(B-Z)T
 LoRa.menu.pnum.ACSIP_S76S.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
 LoRa.menu.pnum.ACSIP_S76S.build.cmsis_lib_gcc=arm_cortexM0l_math
-LoRa.menu.pnum.ACSIP_S76S.build.extra_flags=-D{build.product_line} {build.enable_usb} {build.xSerial} -D__CORTEX_SC=0
+LoRa.menu.pnum.ACSIP_S76S.build.st_extra_flags=-D{build.product_line} {build.enable_usb} {build.xSerial} -D__CORTEX_SC=0
 
 # RAK811_TRACKER board
 LoRa.menu.pnum.RAK811_TRACKER=RAK811 LoRa Tracker (16kb RAM)