MAINTAINERS: qcom: move Andy Gross to credits

MAINTAINERS: qcom: move Andy Gross to credits

Andy's last emails related to Qualcomm SoC ARM subarchitecture are from
November 2019, so move him to credits.  Stale maintainer entries hide
information whether subsystem needs help, has a bus-factor or is even
orphaned.

Link: https://lore.kernel.org/all/?q=f%3A%22Andy+Gross%22
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231211155533.106003-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>