drm/tegra: Increase compile test coverage

The ARCH_MULTIPLATFORM dependency was introduced back when Tegra didn't
support multiplatform yet as a means to allow the driver to be easily
compile-tested along with other DRM drivers. In the meantime, the new
COMPILE_TEST Kconfig option has been introduced for exactly that
purpose, so use that instead to clarify the intention.
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/Kconfig

 config DRM_TEGRA
 	tristate "NVIDIA Tegra DRM"
-	depends on ARCH_TEGRA || ARCH_MULTIPLATFORM
+	depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
 	depends on DRM
 	depends on RESET_CONTROLLER
 	select TEGRA_HOST1X