arch-arm: gdb support Thumb-2 ISA
arch-arm: gdb support Thumb-2 ISA

From the document*1, we should allow 2,3,4 in kind check function for
supporting all kinds of ARM breakpoint.

1. https://sourceware.org/gdb/current/onlinedocs/gdb/ARM-Breakpoint-Kinds.html

Change-Id: I82bcb88cfe6e80e7f17cd6bb68a26a45ace7b174
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54124
Reviewed-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Maintainer: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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