[ET-VK] Fixing out_limits_scaled calculation for conv2d pw ops. (#11271)

This PR was created by the merge bot to help merge the original PR into
the main branch.
ghstack PR number: #11251 by
@trivedivivek
^ Please use this as the source of truth for the PR details, comments,
and reviews
ghstack PR base:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/107/base
ghstack PR head:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/107/head
Merge bot PR base:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/102/orig
Merge bot PR head:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/107/orig
@diff-train-skip-merge

---------

Co-authored-by: Vivek Trivedi <[email protected]>

Author: pytorchbot

backends/vulkan/runtime/graph/ops/glsl/conv2d_pw.glsl

@@ -46,7 +46,9 @@ layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;
  * size is only 1x1, making it easier to re-use loaded texels from t_kernel.
  */
 void main() {
-  const int out_limits_scaled[2] = {out_limits.x + (TILE_SIZE_X - 1) * TILE_SIZE_X, out_limits.y + (TILE_SIZE_Y - 1) * TILE_SIZE_Y};
+  const int out_limits_scaled[2] =
+    {(out_limits.x + (TILE_SIZE_X - 1)) / TILE_SIZE_X,
+     (out_limits.y + (TILE_SIZE_Y - 1)) / TILE_SIZE_Y};
 
   const int div_by_x = int(gl_GlobalInvocationID.x / out_limits_scaled[0]);
   const int out_pos[3] = {int(gl_GlobalInvocationID.x % out_limits_scaled[0]), div_by_x, int(gl_GlobalInvocationID.y)};

backends/vulkan/runtime/graph/ops/glsl/conv2d_pw_s1p0.glsl

@@ -48,7 +48,9 @@ layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;
  * size is only 1x1, making it easier to re-use loaded texels from t_kernel.
  */
 void main() {
-  const int out_limits_scaled[2] = {out_limits.x + (TILE_SIZE_X - 1) * TILE_SIZE_X, out_limits.y + (TILE_SIZE_Y - 1) * TILE_SIZE_Y};
+  const int out_limits_scaled[2] =
+    {(out_limits.x + (TILE_SIZE_X - 1)) / TILE_SIZE_X,
+     (out_limits.y + (TILE_SIZE_Y - 1)) / TILE_SIZE_Y};
 
   const uint16_t div_by_x = uint16_t(gl_GlobalInvocationID.x / out_limits_scaled[0]);
   const uint16_t out_pos_xy[2] = {uint16_t(gl_GlobalInvocationID.x % out_limits_scaled[0]), div_by_x};