drm/bridge: dw-mipi-dsi.c: remove unused header file

dw-mipi-dsi does not use any definition from drm_probe_helper.

Coverity output:
Event unnecessary_header:
Including .../include/drm/drm_probe_helper.h does not provide any
needed symbols.

Reviewed-by: Yannick Fertre <[email protected]>
Cc: Gustavo Pimentel <[email protected]>
Cc: Joao Pinto <[email protected]>
Cc: Jose Abreu <[email protected]>
Signed-off-by: Angelo Ribeiro <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/171ff1fb3918664a570dc8f2f34b446612505f76.1585832665.git.angelo.ribeiro@synopsys.com

Author: Angelo Ribeiro

drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c

@@ -27,7 +27,6 @@
 #include <drm/drm_modes.h>
 #include <drm/drm_of.h>
 #include <drm/drm_print.h>
-#include <drm/drm_probe_helper.h>
 
 #define HWVER_131			0x31333100	/* IP version 1.31 */