Add BMP280 kernel config for Witherspoon.

Change-Id: I09b7b98e03e5fa30dfd3c37563e68cf751dd8c84
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-obmc/witherspoon.cfg b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-obmc/witherspoon.cfg
index 886137e..c5fe514 100644
--- a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-obmc/witherspoon.cfg
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-obmc/witherspoon.cfg
@@ -3,3 +3,4 @@
 CONFIG_SENSORS_MAX31785=y
 CONFIG_SENSORS_UCD9000=y
 CONFIG_RTC_DRV_RV8803=y
+CONFIG_BMP280=y