msm: subsys-pil-tz: Move venus PIL support to generic PIL/SSR driver

With the generic PIL and SSR driver, there is no need to have an
individual venus PIL driver. Therefore, remove the standalone PIL
venus driver and move the PIL and SSR support for venus to
subsys-pil-tz.

Change-Id: I5678ccbf153f3d804d5170a84f9ffe4b0d80483e
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>