arch-arm: Use EL0 permission logic when checking unpriv reference
arch-arm: Use EL0 permission logic when checking unpriv reference

An unprivileged memory reference (LDTR and STTR) executed at EL1
should be regarded as an EL0 memory access

Change-Id: Iae5e6e582f9c5a57340f27a84db463bcb8996922
Signed-off-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50388
Reviewed-by: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>
Maintainer: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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