Ignore A channel in EGL RGB5_A1 clear color tests am: 9da1b45a8e am: 4e33c51c88 am: bf0988368a
Ignore A channel in EGL RGB5_A1 clear color tests am: 9da1b45a8e am: 4e33c51c88
am: bf0988368a

Change-Id: I5e9d96ed89160a81be0a8c7acda446c4a3d9d54a

KhronosGroup/VK-GL-CTS,googlestadia/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,googlestadia/VK-GL-CTS,KhronosGroup/Vulkan-CTS,googlestadia/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,googlestadia/VK-GL-CTS,googlestadia/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,googlestadia/VK-GL-CTS,KhronosGroup/Vulkan-CTS