enx2gen.py: fix setting evexll for rcsae/sae forms
enx2gen.py: fix setting evexll for rcsae/sae forms

Change-Id: Idbbbe3e8e0a0d2fe3c3c219bb2bccb8a7dda1693
(cherry picked from commit 7739482ecd4701adda7e5b5f67ccc197384b74ea)

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