README_UpdateMesaPrebuilts: Update instructions

Change-Id: I76aba0fbe733d1a8bc72e3ea083de7897436d6c3
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
diff --git a/src/shared/mesa_prebuilt/README_UpdateMesaPrebuilts b/src/shared/mesa_prebuilt/README_UpdateMesaPrebuilts
index 4077409..5df7d6b 100644
--- a/src/shared/mesa_prebuilt/README_UpdateMesaPrebuilts
+++ b/src/shared/mesa_prebuilt/README_UpdateMesaPrebuilts
@@ -35,14 +35,13 @@
 
 * Copy new Mesa binaries over from AOSP build:
 
-    $ git clone git@gitlab.com:LinaroLtd/linaro-aosp/linaro-vendor-package
-    $ cd linaro-vendor-package/src/db845c/mesa_prebuilt/
+    $ git clone https://source.devboardsforandroid.linaro.org/linaro-vendor-package
+    $ cd linaro-vendor-package/src/shared/mesa_prebuilt/
     $ ./copy_bins.sh # This script will copy Mesa prebuilt binaries from \
-                       $ANDROID_PRODUCT_OUT pre-set by "lunch db845c-userdebug" \
+                       $ANDROID_PRODUCT_OUT pre-set by "lunch db845c-trunk_staging-userdebug" \
                        or user need to set it explicitly to $AOSP/out/target/product/db845c
 
-  Run "git status" to look for modified binaries. Discard any new *_dri.so in
-  ./lib{,64}/dri/ directory which are usually just a symlink to libgallium_dri.so.
+  Run "git status" to verify the modified binaries.
   Commit the changes with detailed change log and update top-level src/README
   accordingly.
 
@@ -51,17 +50,3 @@
 -----------------------------------------
 * Follow instructions in src/README_PrepareVendorPackage to prepare linaro
   vendor-package for AOSP.
-
-
-Troubleshooting:
-----------------
-* Upstream has a new dependency on meson version >= 0.54 and Python (3.x)
-  mako module >= 0.8.0 now, and that broke the build on Ubuntu 20.04.5.
-  So install python3-mako and update meson:
-
-    $ sudo apt install python3-mako
-
-    $ sudo add-apt-repository ppa:ubuntu-support-team/meson
-    $ sudo apt update
-    $ sudo apt install meson
-  h/t: https://launchpad.net/~ubuntu-support-team/+archive/ubuntu/meson