MAINTAINERS: add entry for VKMS

Add myself as maintainer of VKMS driver

Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200904130605.vs5tnfhgnemnz6pt@smtp.gmail.com
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