Updated debug architecture version checks for fbsd

There are two new debug architecture version entries.  I updated the
code for Linux, but fbsd also needs updating.

This patch does this, and should be pretty straightforward.

I can't test this on native fbsd, but I'm fairly confident it should
work.

Signed-off-by: Luis Machado <luis.machado@arm.com>

gdb/aarch64-fbsd-nat.c

@@ -215,6 +215,8 @@ aarch64_fbsd_nat_target::probe_debug_regs (int pid)
 	    case AARCH64_DEBUG_ARCH_V8_1:
 	    case AARCH64_DEBUG_ARCH_V8_2:
 	    case AARCH64_DEBUG_ARCH_V8_4:
+	    case AARCH64_DEBUG_ARCH_V8_8:
+	    case AARCH64_DEBUG_ARCH_V8_9:
 	      break;
 	    default:
 	      return;