ARM: imx: Enable SPL DTO application support for i.MX8MP DHCOM PDK2

Enable SPL DTO support to apply matching SoM specific DTOs to cater
for the SoM differences in DH i.MX8MP DHCOM PDK2 configuration. This
is already enabled in DH i.MX8MP DHCOM PDK3 configuration so align
the two configurations.

Fixes: ad1158c5 ("arm64: dts: imx8mp: Switch to DT overlays for i.MX8MP DHCOM SoM")
Signed-off-by: Marek Vasut <marex@denx.de>