vk: Use consistent names for anv_*_view variables

vk: Use consistent names for anv_*_view variables

Rename all anv_*_view variables to follow this convention:
    - sview -> anv_surface_view
    - bview -> anv_buffer_view
    - iview -> anv_image_view
    - aview -> anv_attachment_view
    - cview -> anv_color_attachment_view
    - ds_view -> anv_depth_stencil_attachment_view

This clarifies existing code. And it will reduce noise in the upcoming
commits that merge VkAttachmentView into VkImageView.