intel: get depth/stencil format from VkRenderPassCreateInfo

The same info will be removed from VkPipelineDsStateCreateInfo after an
upcoming header change.

Fix bugs in tests.
diff --git a/tests/render_tests.cpp b/tests/render_tests.cpp
index 03d27b3..49aeefc 100644
--- a/tests/render_tests.cpp
+++ b/tests/render_tests.cpp
@@ -1830,6 +1830,7 @@
 
     ASSERT_NO_FATAL_FAILURE(InitState());
     ASSERT_NO_FATAL_FAILURE(InitViewport());
+    m_depth_stencil_fmt = VK_FORMAT_D16_UNORM;
     m_depthStencil->Init(m_device, (int32_t)m_width, (int32_t)m_height);
 
     VkConstantBufferObj meshBuffer(m_device,sizeof(g_vb_solid_face_colors_Data)/sizeof(g_vb_solid_face_colors_Data[0]),
@@ -2735,6 +2736,7 @@
 
     ASSERT_NO_FATAL_FAILURE(InitState());
     ASSERT_NO_FATAL_FAILURE(InitViewport());
+    m_depth_stencil_fmt = VK_FORMAT_D16_UNORM;
     m_depthStencil->Init(m_device, (int32_t)m_width, (int32_t)m_height);
 
     VkConstantBufferObj meshBuffer(m_device, num_verts,