arm64: move AARCH64_BREAK_FAULT into insn-def.h

arm64: move AARCH64_BREAK_FAULT into insn-def.h

If CONFIG_ARM64_LSE_ATOMICS is off, encoders for LSE-related instructions
can return AARCH64_BREAK_FAULT directly in insn.h. In order to access
AARCH64_BREAK_FAULT in insn.h, we can not include debug-monitors.h in
insn.h, because debug-monitors.h has already depends on insn.h, so just
move AARCH64_BREAK_FAULT into insn-def.h.

It will be used by the following patch to eliminate unnecessary LSE-related
encoders when CONFIG_ARM64_LSE_ATOMICS is off.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20220217072232.1186625-2-houtao1@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>