turnip: delete unused tu_fence_signal function

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6683>
diff --git a/src/freedreno/vulkan/tu_fence.c b/src/freedreno/vulkan/tu_fence.c
index 1ee88b5..11c93ca 100644
--- a/src/freedreno/vulkan/tu_fence.c
+++ b/src/freedreno/vulkan/tu_fence.c
@@ -138,16 +138,6 @@
 }
 
 /**
- * Signal a fence.  \a fence must be in the reset state.
- */
-void
-tu_fence_signal(struct tu_fence *fence)
-{
-   assert(tu_fence_get_state(fence) == TU_FENCE_STATE_RESET);
-   tu_fence_set_state(fence, TU_FENCE_STATE_SIGNALED, -1);
-}
-
-/**
  * Wait until a fence is idle (i.e., not pending).
  */
 void
diff --git a/src/freedreno/vulkan/tu_private.h b/src/freedreno/vulkan/tu_private.h
index 811ade7..6c43e97 100644
--- a/src/freedreno/vulkan/tu_private.h
+++ b/src/freedreno/vulkan/tu_private.h
@@ -305,8 +305,6 @@
 void
 tu_fence_copy(struct tu_fence *fence, const struct tu_fence *src);
 void
-tu_fence_signal(struct tu_fence *fence);
-void
 tu_fence_wait_idle(struct tu_fence *fence);
 
 struct tu_queue