devlink: Add support for 64bit parameters

devlink: Add support for 64bit parameters

Kernel commit c0ef144695910 ("devlink: Add support for u64 parameters")
added support for 64bit devlink parameters, add the support for them
also into devlink utility userspace counterpart.

Tested on Microchip EDS2 development board...

Prior patch:

root@eds2:~# devlink dev param set i2c/1-0070 name clock_id value 1234 cmode driverinit
Value type not supported
root@eds2:~#

After patch:

root@eds2:~# devlink dev param set i2c/1-0070 name clock_id value 1234 cmode driverinit
root@eds2:~#

Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>