slimbus: Use physical address type where physical address is used

Use physical address type for buffers using physical address.
(e.g. interaction with data-mover engine)

Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>