ARM: OMAP2+: board-generic: Remove i2c static init

This mainly reverts the commit that was adding the i2c static init.

Since the i2c and twl nodes are now present, there is no need
for the static initialization anymore.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>