backend-drm: remove unnecessary ifdefs

Remove unnecessary ifdefs for DRM_MODE_CONNECTOR_DSI, DRM_MODE_CONNECTOR_DPI.
They are both provided by libdrm and were introduced long before 2.4.83 (the
lowest version we currently support).

Signed-off-by: Leandro Ribeiro <leandrohr@riseup.net>

libweston/backend-drm/drm.c

@@ -1136,13 +1136,9 @@ static const char * const connector_type_names[] = {
 	[DRM_MODE_CONNECTOR_HDMIB]       = "HDMI-B",
 	[DRM_MODE_CONNECTOR_TV]          = "TV",
 	[DRM_MODE_CONNECTOR_eDP]         = "eDP",
-#ifdef DRM_MODE_CONNECTOR_DSI
 	[DRM_MODE_CONNECTOR_VIRTUAL]     = "Virtual",
 	[DRM_MODE_CONNECTOR_DSI]         = "DSI",
-#endif
-#ifdef DRM_MODE_CONNECTOR_DPI
 	[DRM_MODE_CONNECTOR_DPI]         = "DPI",
-#endif
 };
 
 /** Create a name given a DRM connector