main/dtbtool-sprd: add dtc as a dependency as a fallback
Currently, dtbtool-sprd has an argument -p which accepts the path to the dtc binary. When it's not provided, it should use the dtc binary installed in the system as a fallback. However, that's not the case. The following error is reported:
Found file: test.dtb ... skip, failed to scan for 'sprd,sc-id = <' tag
...even though test.dtb has the sprd,sc-id
property.
In order to mitigate such issues, install dtc as a dependency of the package.