gdbstub: extend GByteArray to read register helpers

gdbstub: extend GByteArray to read register helpers

Instead of passing a pointer to memory now just extend the GByteArray
to all the read register helpers. They can then safely append their
data through the normal way. We don't bother with this abstraction for
write registers as we have already ensured the buffer being copied
from is the correct size.

Signed-off-by: Alex Bennée <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Acked-by: David Gibson <[email protected]>
Reviewed-by: Damien Hedde <[email protected]>
Message-Id: <20200316172155[email protected]>