dt-bindings: arm: qcom: Add Xiaomi Mi Pad 5 Pro (xiaomi-elish)

Add a compatible for Xiaomi Mi Pad 5 Pro.

Signed-off-by: Jianhua Lu <lujianhua000@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230131123515.833-1-lujianhua000@gmail.com