MAINTAINERS: Change QCOM entries

This patch changes the email address for Andy Gross and David Brown and drops
Kumar Gala.  In addition, it changes the location of the repository

Signed-off-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>
Acked-by: David Brown <david.brown@linaro.org>
Acked-by: Kumar Gala <galak@codeaurora.org>