google/kahlee: Select fanless SMU firmware

Don't rely on the cascading default values.  Ensure Kahlee uses the fanless
versions of the SMU fimware by selecting it.

Change-Id: I0761266f2a4026ebc251b64074c10481118734a2
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22251
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/kahlee/Kconfig

@@ -31,6 +31,8 @@ config BOARD_GOOGLE_BASEBOARD_KAHLEE
 	select MAINBOARD_HAS_LPC_TPM
 	select SERIRQ_CONTINUOUS_MODE
 	select STONEYRIDGE_UART
+	select SOC_AMD_PSP_SELECTABLE_SMU_FW
+	select SOC_AMD_SMU_FANLESS
 
 if BOARD_GOOGLE_BASEBOARD_KAHLEE