[PATCH] pte_fsl_booke: fix instruction TLB error permission check

[Liu Dave-R63238]

> I've updated the commit message to be a bit more clear on why 
> we need to do this.

I'm curious why the _PAGE_EXEC have different definition in pte-book3e.h
and pte-fsl-booke.h?

It is UX permission in pte-book3e, but is SX permission in
pte-fsl-booke.h.

Thanks, Dave