vulkan: Rename viewport_state::negative_one_to_one

This makes it a bit clearer what it's for.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18878>

src/vulkan/runtime/vk_graphics_state.c

@@ -376,7 +376,7 @@ vk_viewport_state_init(struct vk_viewport_state *vp,
       vk_find_struct_const(vp_info->pNext,
                            PIPELINE_VIEWPORT_DEPTH_CLIP_CONTROL_CREATE_INFO_EXT);
    if (vp_dcc_info != NULL)
-      vp->negative_one_to_one = vp_dcc_info->negativeOneToOne;
+      vp->depth_clip_negative_one_to_one = vp_dcc_info->negativeOneToOne;
 }
 
 static void

src/vulkan/runtime/vk_graphics_state.h

@@ -150,7 +150,7 @@ struct vk_tessellation_state {
 
 struct vk_viewport_state {
    /** VkPipelineViewportDepthClipControlCreateInfoEXT::negativeOneToOne */
-   bool negative_one_to_one;
+   bool depth_clip_negative_one_to_one;
 
    /** VkPipelineViewportStateCreateInfo::viewportCount */
    uint8_t viewport_count;