The register request via gdbstub would return the SR part
which contains the Trace/Master/IRQ state flags, but
would be missing the CR (Condition Register) state bits.

This fix adds this support by merging them in the m68k
specific gdbstub handler m68k_cpu_gdb_read_register for SR register.

Signed-off-by: Lucien Murray-Pitts <lucienmp.qemu@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20190609105154.GA16755@localhost.localdomain>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>