fastmodel: CortexR52 support gdb

We change several things to support basic gdb.

1. Correct the memory translation.
memory_getUsefulAddressTranslations returns an empty list. So there's no
memory translation in R52.

2. Implement FPSCR for gdb collecting status.

3. Correct the breakpoint memory space.

Change-Id: Icc824502faec5ac228003f0de7e9dbe26babe7ef
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52623
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Earl Ou <shunhsingou@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed