Remove bail on VK_PHYSICAL_DEVICE_TYPE_CPU from VulkanInterface::init

This was added as a temporary measure to prevent one type of emulator
where RE-GaneshVk lead to a black screen on boot from being affected by
flag-based rollouts of RE's Vulkan backends. That emulator now
explicitly sets debug.renderengine.backend=skiaglthreaded, so removing
this check will allow tests to be run against RE's VK backends on other
emulators.

Test: manual + librenderengine_test
Flag: EXEMPT actually gated by sysprop and 2 flags
Bug: b/327230380
Change-Id: I2bb31b0ff76344082c6f5b6396a52b093edb99a1