EDMA1 is required for the SPI controller used on the ZII boards to be
functional.  Enable EDMA1.

Fixes: 14c41633 ("ARM: dts: vfxxx: Enable DMA for DSPI on Vybrid")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>