ARM: qcom: include defconfig in MAINTAINERS

The ARM Qualcomm entry should cover also its defconfig.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220727065830.10681-5-krzysztof.kozlowski@linaro.org