[hack] beaglebone: Add a EDMA controler description to the platform's FDT
[hack] beaglebone: Add eMMC dfinition to the platform's FDT

Add eMMC dfinition to the platform's FDT so the it is possible to boot
form eMMC using the DT file that comes with the upstream kernel.
si476x: Add very basic support of DT

Add very basic support of DT and add a new chip SI4735 as supported
one(Not really working yet).
[hack] beaglebone: Add radio device to DT to reflect dev setup