mfd: add missing Kconfig entry for da903x

This one was accidentally left out during the rc1 mfd merge.

Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0acefe8..9a5ad8a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -30,3 +30,5 @@
 obj-$(CONFIG_MCP_UCB1200)	+= ucb1x00-assabet.o
 endif
 obj-$(CONFIG_UCB1400_CORE)	+= ucb1400_core.o
+
+obj-$(CONFIG_PMIC_DA903X)	+= da903x.o
\ No newline at end of file