MAINTAINERS: add qcom i2c and spi drivers to list

This patch adds i2c-qup and spi-qup drivers in to the qualcomm
maintainer list, so that get maintainers scripts can get correct people
to send patch to.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Ivan T. Ivanov <iivanov.xz.@gmail.com>
Signed-off-by: Andy Gross <andy.gross@linaro.org>