target-arm: Honour NS bits in page tables

Honour the NS bit in ARM page tables:
 * when adding entries to the TLB, include the Secure/NonSecure
   transaction attribute
 * set the NS bit in the PAR when doing ATS operations

Note that we don't yet correctly use the NSTable bit to
cause the page table walk itself to use the right attributes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

include/exec/memattrs.h

@@ -29,6 +29,8 @@ typedef struct MemTxAttrs {
      * "didn't specify" if necessary.
      */
     unsigned int unspecified:1;
+    /* ARM/AMBA TrustZone Secure access */
+    unsigned int secure:1;
 } MemTxAttrs;
 
 /* Bus masters which don't specify any attributes will get this,