Tegra has drm.h header in include/drm instead of include/libdrm
Both paths are defined in libdrm.pc, but those are not used since this
cmake file searches only for xf86drm.h.
Change-Id: If1e979c7d5aec520b18eed5b3fcbb5ac2e15cc62
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>