y-flip should require vulkan 1.1

[m4b]

Description
Today, whether y-flip is supported (and whether we ignore the adapter) is determined here:

wgpu/wgpu-hal/src/vulkan/adapter.rs

Line 937 in 48f8811

&& phd_capabilities.properties.api_version < vk::API_VERSION_1_2

Specifically, the vulkan 1.2 requirement may be too strict. My reading of https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/VK_AMD_negative_viewport_height.html#_obsoletion_by_vk_khr_maintenance1_and_vulkan_1_1 seems to indicate that vulkan 1.1 is sufficient, and the check at the above location is safe to reduce to 1.1 for conformant drivers.

Repro steps
I hit this running on the panvk driver, which while not conformant, reports 1.1, but does not have the amd extension nor the VK_KHR_maintenance1 extension.

Expected vs observed behavior
Can run wgpu on vulkan 1.1 conformant driver.