dragonboards: Update mesa prebuilt binaries to mesa-24.0.2

Update mesa prebuilt binaries built from mesa-24.0.2 tag,
https://android.googlesource.com/platform/external/mesa3d/+/refs/tags/upstream-mesa-24.0.2,
and update top-level README for reference.

Cleanup: Removed the unused symlinks to reduce complexity.
Some symlinks still remain but I don't want to touch/break
working systems.

Change-Id: Ibfd7cbbf549d478233f9d2f6749b4c68bde77d64
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
diff --git a/src/README b/src/README
index 0dc236b..f9529b8 100644
--- a/src/README
+++ b/src/README
@@ -32,7 +32,7 @@
     │   │
     │   ├── mesa_prebuilt/
     │   │   Upstream Mesa prebuiilt binaries (covered under original LICENSE) are built from
-    │   │   https://android.googlesource.com/platform/external/mesa3d/+/refs/tags/upstream-mesa-23.0.2
+    │   │   https://android.googlesource.com/platform/external/mesa3d/+/refs/tags/upstream-mesa-24.0.2
     │   │
     │   └── RB3_firmware_20190529180356-v4/
     │       These binaries are covered under LICENSE.qcom.txt