Vulkan: Move memory allocation initialization code into function No functional change expected. This CL wraps all initialization code for VMA allocator and memory suballocation memoryType and alignment calculation into its own function. Bug: b/223428306 Change-Id: Id630bbae035912ad41c51c2bb1cd02c2e438b442 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3563506 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Charlie Lao <cclao@google.com>