drm/hisilicon: Add hisilicon kirin drm master driver

Add kirin DRM master driver for hi6220 SoC which used in HiKey board.
Add dumb buffer feature.
Add prime dmabuf feature.

v9: Add OF and ARM64 depends on in Kconfig
v8: None.
v7:
- Add config.mutex protection when accessing mode_config.connector_list.
- Clean up match data getting.
v6: None.
v5: None.
v4: None.
v3:
- Move and rename all the files to kirin sub-directory.
  So that we could separate different seires SoCs' driver.
- Replace drm_platform_init, load, unload implementation.
v2:
- Remove abtraction layer.

Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
diff --git a/drivers/gpu/drm/hisilicon/Kconfig b/drivers/gpu/drm/hisilicon/Kconfig
new file mode 100644
index 0000000..558c61b
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/Kconfig
@@ -0,0 +1,5 @@
+#
+# hisilicon drm device configuration.
+# Please keep this list sorted alphabetically
+
+source "drivers/gpu/drm/hisilicon/kirin/Kconfig"