google/reef: Fix default values in Kconfig

These default values weren't being set with the default
keyword so were ending up with different values.

from the default generated config file before this change:
CONFIG_DRIVER_TPM_I2C_BUS=0x9
CONFIG_DRIVER_TPM_I2C_ADDR=0x2
CONFIG_DRIVER_TPM_I2C_IRQ=-1

Change-Id: I19514d0c9b2a9b7e479f003a4d3384e073f4d531
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/16828
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/reef/Kconfig

@@ -20,13 +20,16 @@ config BASEBOARD_REEF_LAPTOP
 	select SYSTEM_TYPE_LAPTOP
 
 config DRIVER_TPM_I2C_BUS
-	hex "0x2"
+	hex
+	default 0x2
 
 config DRIVER_TPM_I2C_ADDR
-	hex "0x50"
+	hex
+	default 0x50
 
 config DRIVER_TPM_I2C_IRQ
-	int "60" # GPE0_DW1_28
+	int
+	default 60 # GPE0_DW1_28
 
 config CHROMEOS
 	select LID_SWITCH if BASEBOARD_REEF_LAPTOP