feat(handoff): update register signature

The existing register signature was changed from 0x6ed0ff to account for
0xff being a value that is regularly found in memory [1].

[1] https://github.com/sjg20/firmware_handoff/commit/f70c184905607f6b1d074a5de9aa407a5d92344b

Change-Id: Ib217f1b68df9e534fc61604c88eea4560ecb9dc2
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/include/lib/transfer_list.h b/include/lib/transfer_list.h
index 9ee1f55..8bf16cf 100644
--- a/include/lib/transfer_list.h
+++ b/include/lib/transfer_list.h
@@ -12,7 +12,7 @@
 
 #include <lib/utils_def.h>
 
-#define TRANSFER_LIST_SIGNATURE U(0x006ed0ff)
+#define TRANSFER_LIST_SIGNATURE U(0x4a0fb10b)
 #define TRANSFER_LIST_VERSION U(0x0001)
 
 // Init value of maximum alignment required by any TE data in the TL