openbmc-machines: Remove unncessary CONFIG_HWMON

CONFIG_HWMON is implied by the drivers that use it, so we do not need to
specify it in the defconfigs.

Change-Id: I1c6e8679412f80dc0db69ef0f72a9c73e8602fb9
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/meta-centriq2400-rep/recipes-kernel/linux/linux-obmc/centriq2400-rep.cfg b/meta-centriq2400-rep/recipes-kernel/linux/linux-obmc/centriq2400-rep.cfg
index 713091e..2182623 100644
--- a/meta-centriq2400-rep/recipes-kernel/linux/linux-obmc/centriq2400-rep.cfg
+++ b/meta-centriq2400-rep/recipes-kernel/linux/linux-obmc/centriq2400-rep.cfg
@@ -1,4 +1,3 @@
-CONFIG_HWMON=y
 CONFIG_I2C_MUX=y
 CONFIG_I2C_MUX_PCA9541=y
 CONFIG_I2C_MUX_PCA9641=y