enc2gen: support AMX memory "ptr" oc2 operands
enc2gen: support AMX memory "ptr" oc2 operands

(cherry picked from commit 6fd2f4b7ff57b1340b17dee3c04cf6e960da905e)

intelxed/xed,intelxed/xed,intelxed/xed,intelxed/xed