panfrost: Implement FIXED formats

Fixes crash in dEQP-GLES2.functional.draw.random.9

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
diff --git a/src/gallium/drivers/panfrost/pan_format.c b/src/gallium/drivers/panfrost/pan_format.c
index cb1c71f..a61d7b1 100644
--- a/src/gallium/drivers/panfrost/pan_format.c
+++ b/src/gallium/drivers/panfrost/pan_format.c
@@ -194,6 +194,15 @@
                         assert(0);
                         break;
 
+                case PIPE_FORMAT_R32_FIXED:
+                        return MALI_R32_FIXED;
+                case PIPE_FORMAT_R32G32_FIXED:
+                        return MALI_RG32_FIXED;
+                case PIPE_FORMAT_R32G32B32_FIXED:
+                        return MALI_RGB32_FIXED;
+                case PIPE_FORMAT_R32G32B32A32_FIXED:
+                        return MALI_RGBA32_FIXED;
+
                 default:
                         /* Fallthrough to default */
                         break;