Build: CS1000: Sync provisioning bundle offset

The BL1_1 code size was increased for Corstone-1000 in TF-M so the
bl1.bin generation has to be aligned with the changes.

Change-Id: I25a658691c7c4123b76e434b2f7b2c00a666665e
Signed-off-by: Bence Balogh <bence.balogh@arm.com>
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 1eb8b1b..5d73aec 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -89,7 +89,7 @@
 
     # Keys will append extra commands when matching target_platform
     "post_build": {"arm/corstone1000": ("dd conv=notrunc bs=1 if=%(ci_build_root_dir)s/spe/bin/bl1_1.bin of=%(ci_build_root_dir)s/spe/bin/bl1.bin seek=0;"
-                                        "dd conv=notrunc bs=1 if=%(ci_build_root_dir)s/spe/bin/bl1_provisioning_bundle.bin of=%(ci_build_root_dir)s/spe/bin/bl1.bin seek=49152;"
+                                        "dd conv=notrunc bs=1 if=%(ci_build_root_dir)s/spe/bin/bl1_provisioning_bundle.bin of=%(ci_build_root_dir)s/spe/bin/bl1.bin seek=51200;"
                                         "%(codebase_root_dir)s/platform/ext/target/arm/corstone1000/create-flash-image.sh %(ci_build_root_dir)s/spe/bin/ cs1000.bin;"),
                     "arm/musca_b1": ("if [ -d \"%(ci_build_root_dir)s/nspe\" ]; then "
                                      "srec_cat "