arch-arm: Fix Secure state check in checkFPAdvSIMDTrap64
arch-arm: Fix Secure state check in checkFPAdvSIMDTrap64

The old code does secure state check by using "el <= EL2", which
mis-considers secure EL1 and EL0. This patch fixes this by using
inSecureState as in ARM ARM.

Change-Id: I01d847c6af022c1462b16206cbc576f15f5569fd
Reviewed-by: Jack Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/8081
Reviewed-by: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>
Maintainer: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>

gem5/gem5,gem5/gem5,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,gem5/gem5