drm/mediatek: Fix indentation in Makefile

Fix indentation in the Makefile by replacing spaces with tabs.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: CK Hu <ck.hu@mediatek.com>

drivers/gpu/drm/mediatek/Makefile

@@ -21,7 +21,7 @@ obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
 mediatek-drm-hdmi-objs := mtk_cec.o \
 			  mtk_hdmi.o \
 			  mtk_hdmi_ddc.o \
-                          mtk_mt2701_hdmi_phy.o \
+			  mtk_mt2701_hdmi_phy.o \
 			  mtk_mt8173_hdmi_phy.o \
 			  mtk_hdmi_phy.o