Corrects texture swizzle in Vulkan backend. Previously user-supplied
swizzle was applied before internal swizzle; this change applies the
internal swizzle first, causing the correct behavior.

Also recreates image views when swizzle is dirty.

Test: ./angle_deqp_gles3_no_gtest --deqp-egl-display-type=angle-vulkan -n 'dEQP-GLES3.functional.texture.swizzle.*'
Test: ./angle_end2end_tests --gtest_filter='SwizzleTest.*/ES3_Vulkan'

Bug: angleproject:3212
Change-Id: Ie2c44b479da5c19ba744ace7562a73c944f97a49
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1660909
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>