uboot-imx

spi: atmel_dataflash: Simplify AT91F_SpiEnable implementation

Refactor the code a bit to make it better in readability.
Remove the comments because now the intention of the code is pretty clear.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>