misc: Revert gem5 versioning for develop branch

Change-Id: I80cbfc766c71a3137a427d38da4f46b80cd39856
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60639
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

src/Doxyfile

@@ -31,7 +31,7 @@ PROJECT_NAME           = gem5
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = v22.0.0.1
+PROJECT_NUMBER         = DEVELOP-FOR-22.1
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 

src/base/version.cc

@@ -32,6 +32,6 @@ namespace gem5
 /**
  * @ingroup api_base_utils
  */
-const char *gem5Version = "22.0.0.1";
+const char *gem5Version = "[DEVELOP-FOR-22.1]";
 
 } // namespace gem5