arch-arm: Use isSecure variable for Stage2Lookup
arch-arm: Use isSecure variable for Stage2Lookup

TLB entries are tagged with the security state of the cpu instead
of the security attribute of the physical address

Change-Id: I728ba1c841de1ec6c1ee03aee012b185c968d078
Signed-off-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Reviewed-by: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/32639
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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