ARM: dts: samsung: fix Exynos4212 Tab3 makefile entries

Makefile targets are DTB, not DTS.

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Closes: https://lore.kernel.org/linux-arm-kernel/CA+G9fYsfziBmQGQMGAKojhemCXssFyiNgk6aNjVXpJNNFh_5mg@mail.gmail.com/
Fixes: ee37a457

 ("ARM: dts: exynos: Add Samsung Galaxy Tab 3 8.0 boards")
Reviewed-by: Artur Weber <aweber.kernel@gmail.com>
Link: https://lore.kernel.org/r/20230720141537.188869-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>