davinci: DA830/OMAP-L137 EVM: remove ifdefs inside da830_evm_init()

Remove ifdefs inside da830_evm_init function since they are
discouraged in Documentation/SubmittingPatches section 2.2

Use the method outlined in that document for fixing it.

Tested on DA830 EVM.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>