arm64: defconfig: Enable CONFIG_IMX8MM_THERMAL as module

Enable CONFIG_IMX8MM_THERMAL as module to support i.MX8MM
thermal driver.
Signed-off-by: NAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -455,6 +455,7 @@ CONFIG_CPU_THERMAL=y
 CONFIG_THERMAL_EMULATION=y
 CONFIG_QORIQ_THERMAL=m
 CONFIG_IMX_SC_THERMAL=m
+CONFIG_IMX8MM_THERMAL=m
 CONFIG_ROCKCHIP_THERMAL=m
 CONFIG_RCAR_THERMAL=y
 CONFIG_RCAR_GEN3_THERMAL=y