fix i2c build errors

It seems to be a merge error in the omap tree that causes the following
build errors with e.g. ateb9200_defconfig:

<--  snip  -->

...
  MODPOST 93 modules
ERROR: "__i2c_board_list" [drivers/i2c/i2c-core.ko] undefined!
ERROR: "__i2c_board_lock" [drivers/i2c/i2c-core.ko] undefined!
ERROR: "__i2c_first_dynamic_bus_num" [drivers/i2c/i2c-core.ko] undefined!
make[2]: *** [__modpost] Error 1

<--  snip  -->
Signed-off-by: Adrian Bunk <adrian.bunk@movial.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/Makefile

@@ -34,7 +34,7 @@ obj-$(CONFIG_SERIO)		+= input/serio/
 obj-y				+= serial/
 obj-$(CONFIG_PARPORT)		+= parport/
 obj-y				+= base/ block/ misc/ mfd/ net/ media/ cbus/
-obj-$(CONFIG_I2C)		+= i2c/
+obj-y				+= i2c/
 obj-y				+= cbus/
 obj-$(CONFIG_ARCH_OMAP)		+= dsp/dspgateway/
 obj-$(CONFIG_NUBUS)		+= nubus/