ARM: sunxi_defconfig: Enable sunxi IR driver

A consumer IR receiver is commonly found on Allwinner SoC based
development boards and set top boxes. The driver has been available
for some time. Enable it by default.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>