adt-installer: Set INHIBIT_DEFAULT_DEPS

We've been seeing an issue on the autobuilder due to the way it builds package feed indexes. Packages get copied into the nightly build which then creates indexes however this is done without the knowledge of sstate. When adt-installer is built, it has dependencies on the toolchain and when ipk files already exist, the build throws errors.

Since this recipe doesn't need a toolchain, we can remove the dependencies to work around this for now. I'm not particularly happy with what the autobuilder is doing but that is a post release issue.

index a90a2b4..07070b5 100644
@@ -29,6 +29,7 @@ LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=4d92cd373abda3937c2bc47fbc49d
 LICENSE = "MIT"
 
 PACKAGES = ""
+INHIBIT_DEFAULT_DEPS = "1"
 
 PR = "r11"