lib: remove kmstest_create_fb

Use the new-style function using drm fourcc codes instead everywhere.

To easily use thew fourcc based interface also expose
bpp_depth_to_drm_format from the library. Finally include drm_fourcc.h
from the igt_kms.h header since pretty much everyone needs this now.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/pm_lpsp.c

@@ -95,8 +95,9 @@ static uint32_t create_fb(int drm_fd, int width, int height)
 	cairo_t *cr;
 	uint32_t buffer_id;
 
-	buffer_id = kmstest_create_fb(drm_fd, width, height, 32, 24, false,
-				      &fb);
+	buffer_id = kmstest_create_fb2(drm_fd, width, height,
+				      DRM_FORMAT_XRGB8888,
+				      false, &fb);
 	cr = kmstest_get_cairo_ctx(drm_fd, &fb);
 	kmstest_paint_test_pattern(cr, width, height);
 	cairo_destroy(cr);