MAINTAINERS: Update email-id of Sinan Kaya

I'm no longer with QCOM. I am still interested in maintaining or reviewing
PCI/DMA engine patches. Update email-id to an active one.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>