anv: Get rid of the stub() macros

Except for a few unimplemented things on gen7, we don't really have
stubs anymore so we should drop this.  This commit replaces the few gen7
stub() calls with explicitly labeled finishme's and makes the sparse
binding stuff silently no-op or return a FEATURE_NOT_PRESENT error.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/gen7_cmd_buffer.c

@@ -270,7 +270,7 @@ void genX(CmdSetEvent)(
     VkEvent                                     event,
     VkPipelineStageFlags                        stageMask)
 {
-   stub();
+   anv_finishme("Implement events on gen7");
 }
 
 void genX(CmdResetEvent)(
@@ -278,7 +278,7 @@ void genX(CmdResetEvent)(
     VkEvent                                     event,
     VkPipelineStageFlags                        stageMask)
 {
-   stub();
+   anv_finishme("Implement events on gen7");
 }
 
 void genX(CmdWaitEvents)(
@@ -294,7 +294,7 @@ void genX(CmdWaitEvents)(
     uint32_t                                    imageMemoryBarrierCount,
     const VkImageMemoryBarrier*                 pImageMemoryBarriers)
 {
-   stub();
+   anv_finishme("Implement events on gen7");
 
    genX(CmdPipelineBarrier)(commandBuffer, srcStageMask, destStageMask,
                             false, /* byRegion */