arm64: defconfig: enable ath11k driver

Enable Atheros Ath11k driver to be built on arm64 platforms.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220131165056.2117434-2-dmitry.baryshkov@linaro.org