pan/mdg: Bump compiler RT maximum

We don't actually support MRT 8x yet but we would like to soon, so bump
it in the compiler.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5929>

src/panfrost/midgard/compiler.h

@@ -225,10 +225,14 @@ typedef struct midgard_bundle {
 } midgard_bundle;
 
 enum midgard_rt_id {
-        MIDGARD_COLOR_RT0,
+        MIDGARD_COLOR_RT0 = 0,
         MIDGARD_COLOR_RT1,
         MIDGARD_COLOR_RT2,
         MIDGARD_COLOR_RT3,
+        MIDGARD_COLOR_RT4,
+        MIDGARD_COLOR_RT5,
+        MIDGARD_COLOR_RT6,
+        MIDGARD_COLOR_RT7,
         MIDGARD_ZS_RT,
         MIDGARD_NUM_RTS,
 };