Don't explicitly include vulkan.h in the vulkan memory allocator.

Bug: skia:
Change-Id: I57dc374822fd22e25ef22d03345bdd2e159c7edd
Reviewed-on: https://skia-review.googlesource.com/135048
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed