ARM: dts: imx6qdl-hummingboard2: add v1.5 som without eMMC
Add support for the v1.5 SOM with TI Wi-Fi but without eMMC. As the
pinmux settings are different for the microsom, we need to use a
separate board-level dts for this as there is no support for overlays.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>