Update RT views and framebuffer in vulkan after mipmaping

src/gpu/vk/GrVkGpu.cpp

Index: src/gpu/vk/GrVkGpu.cpp
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index b995ed91aa10303d4a6cedc58b4d116611565ed9..76d50b0959beaaface643b798ebb55b25f7e0ee8 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -770,7 +770,7 @@ GrRenderTarget* GrVkGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDe
     return tgt;
 }
 
-void GrVkGpu::generateMipmap(GrVkTexture* tex) const {
+void GrVkGpu::generateMipmap(GrVkTexture* tex) {
     // don't do anything for linearly tiled textures (can't have mipmaps)
     if (tex->isLinearTiled()) {
         SkDebugf("Trying to create mipmap for linear tiled texture");