mb/system76/lemp9: Enable battery charging thresholds

Change-Id: I5131cf350d5b8c2a45f8d8245c0df26742c0d732
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45533
Reviewed-by: Jeremy Soller <jeremy@system76.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/system76/lemp9/Kconfig

@@ -5,6 +5,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select BOARD_ROMSIZE_KB_16384
 	select DRIVERS_I2C_HID
 	select EC_SYSTEM76_EC
+	select EC_SYSTEM76_EC_BAT_THRESHOLDS
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
 	select HAVE_SMI_HANDLER