MAINTAINERS: Make Manivannan Sadhasivam the maintainer of qcom_edac

The current maintainers have left Qualcomm and their email addresses were
bouncing. Since I couldn't get hold of them now, I'm volunteering myself
to maintain this driver.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
Link: https://lore.kernel.org/r/20220812060602.7672-4-manivannan.sadhasivam@linaro.org