Fix SparkFun MicroMod compilation issues

Fixes: espressif#5818

Author: me-no-dev

boards.txt

@@ -2571,6 +2571,9 @@ esp32micromod.upload.extra_flags=
 esp32micromod.serial.disableDTR=true
 esp32micromod.serial.disableRTS=true
 
+esp32micromod.build.tarch=xtensa
+esp32micromod.build.bootloader_addr=0x1000
+esp32micromod.build.target=esp32
 esp32micromod.build.mcu=esp32
 esp32micromod.build.core=esp32
 esp32micromod.build.variant=esp32micromod