meson: move lang args to the right section

After meson 0.56.0, <lang>_args and <lang>_link_args would be
regarded as meson built-in options.

Signed-off-by: Hsia-Jun(Randy) Li <randy.li@synaptics.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>