Fix the VK_KHR_DISPLAY implementation within the WSI Layer
Surface extents are initialized in this change. This fixes the issues with execution of the wsi layer display backend. Additionally, functional code snippets are moved out of assert calls in the file wsi/display/swapchain.cpp to avoid them being stripped out by ndebug compilation. This change also fixes the unused variable error in ndebug compilation.
Signed-off-by: Ginu Jacob ginu.jacob@arm.com Change-Id: I4ad33ef52dbb81faaf580ce7b89ce74ffe96e002