arm: dts: imx6qdl-u-boot: Enable spba-bus@2000000 simple bus

spba-bus has a few nodes under it including the UART1 and
some ESPI buses.  In order to use them in SPL, the
u-boot,dm-spl flag needs to be added to the spba-bus@2000000
container.

Signed-off-by: Adam Ford <aford173@gmail.com>
1 file changed