7014711: Fork HS20 to HS21 - renumber Major and build numbers of JVM

Summary: Update the Major and Build numbers for HS21
Reviewed-by: jcoomes

make/hotspot_version

@@ -33,9 +33,9 @@
 # Don't put quotes (fail windows build).
 HOTSPOT_VM_COPYRIGHT=Copyright 2011
 
-HS_MAJOR_VER=20
+HS_MAJOR_VER=21
 HS_MINOR_VER=0
-HS_BUILD_NUMBER=07
+HS_BUILD_NUMBER=01
 
 JDK_MAJOR_VER=1
 JDK_MINOR_VER=7