gdb has full support for aarch64 since version 7.6,
current minimum is 7.7.1.
Target build was re-enabled over a year ago, but host-gdb was not.
Related commits:
0e49733b30 gdb disabled for aarch64
4372449a4f target-gdb re-enabled
Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>