ARM: dts: keystone: Use dma-ranges property

The dma-ranges property has to be specified per bus and has format:
 < DMA addr > - Base DMA address for Bus (Bus format 32-bits)
 < CPU addr > - Corresponding base CPU address (CPU format 64-bits)
 < DMA range size > - Size of supported DMA range

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Olof Johansson <olof@lixom.net>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>