Add some logic to EFM32 DMA module.  Still incomplete
EFM32: A little more DMA logic.  Still incomplete
Dangle whitespace removal
EFM32:  Completes very basic DMA support.  Needs review.  Untested
EFM32: Correct handling of DMA descriptors; Add initialization of DMA CTRLBASE
SAM4E-EK:  Add -fno-strict-aliasing
Add debug assertion
EFM32: More fixes to DMA descriptor table logic
EFM32: Fix misconception in DMA control descriptor alignment
EFM32 DMA: Cosmetic changes to debug instrumentatin and comments
EFM32: dma_config_t needs to be only 16-bits for now
Remove unnecessary header file inclusion
EFM32:  Integrate Pierre's SPI driver
EFM32: Integrate SPI DMA capability
Cosmetic update to spacing and comments
EFM32: Cosmetic changes to comments and format
EFM32 SPI: Change some logic that I fear could cause RX data overrun
EFM32 SPI:  Add check to make sure that the SPI RX buffer is empty before starting a transfer
EFM32 SPI: setfrequency() needs to return actual frequency; simplify nbits usages by removing conditional logic
Cosmetic changes