Explicitly set .resize member of xf86CrtcConfigFuncsRec

resize is currently the only member of xf86CrtcConfigFuncsRec, but specify
it explicitly to be more clear, and also more consistent with other
struct initializations.

Cherry-Picked from:
https://chromium.googlesource.com/chromiumos%2Fthird_party%2Fxf86-video-armsoc
eab4e1f89996a6b6490ffbfb22a9cf8db82b2bda

Change-Id: I5e7abf0e36290caf141705c93ff2400d4e0044ef
diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 1bc0be2..5ef8a2e 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -1319,7 +1319,7 @@
 }
 
 static const xf86CrtcConfigFuncsRec drmmode_xf86crtc_config_funcs = {
-		drmmode_xf86crtc_resize
+		.resize = drmmode_xf86crtc_resize
 };