ARM: dts: at91: sama5d2: add dma properties to UART nodes

commit b1708b72 upstream.

The dmas/dma-names properties are added to the UART nodes. Note that additional
properties are needed to enable them at the board level: check bindings for
details.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>