driver: input: add config for smi130 instead of default open

SMI130 driver is default open. In order to avoid build
errors, CONFIG_SMI130 is added.

Change-Id: I05e8c51d9e50b3071debbc09cb5809e6d5eb27a3
Signed-off-by: Tiequan Luo <tieqluo@codeaurora.org>
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 388ab27..7ff1b70 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -33,4 +33,4 @@
 
 obj-$(CONFIG_INPUT_KEYRESET)	+= keyreset.o
 obj-$(CONFIG_INPUT_KEYCOMBO)	+= keycombo.o
-obj-y   += sensors/smi130/
+obj-$(CONFIG_SMI130)   += sensors/smi130/