hwc2: Change SetLayerZOrder Error to Warning

Since an invalid operation is requested on a layer, SDM needs no flag an
error when updateLayerZ. Appropriate error code should be returned and
client is responsible to handle

Change-Id: I12481c591e0b03c8e5bb9fb59cc29ba8b34b0b1d
Signed-off-by: Wenjun Zhang <wjzhan@codeaurora.org>
1 file changed