dtimage.mk: drop RADIOIMAGE settings with dt.img

which seems cause problem of
    "cp: bad 'out/target/product/hikey960/dt.img': No such file or directory"
when run "make dist" command.
The problem is not reported when dropping them.

Test: make dist finished successfully

Change-Id: I0279cc1d072c132958afb0e3660f440cd0515f98
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
1 file changed