Remove usage of 'warpSize' variable as it has been deprecated (#2295)

* SWDEV-535598 - remove usage of 'warpSize' variable as it has been deprecated. Ideally get_warp_size() should not be constexpr but this is just a workaround

* SWDEV-535598 - remove comment from get_warp_size as constexpr is required for this repo

---------

Co-authored-by: Gerardo Hernandez <gerardo.hernandez@amd.com>

[ROCm/composable_kernel commit: 6635d1bb88]

include/ck/utility/get_id.hpp

@@ -9,8 +9,11 @@ namespace ck {
 
 __host__ __device__ constexpr index_t get_warp_size()
 {
-    // warpSize is defined by HIP
-    return warpSize;
+#if defined(__GFX9__) || !defined(__HIP_DEVICE_COMPILE__)
+    return 64;
+#else
+    return 32;
+#endif
 }
 
 __device__ index_t get_thread_local_1d_id() { return threadIdx.x; }

include/ck_tile/core/arch/arch.hpp

@@ -50,8 +50,11 @@ enum struct memory_operation_enum : std::uint16_t
 
 CK_TILE_HOST_DEVICE constexpr index_t get_warp_size()
 {
-    // warpSize is defined by HIP
-    return warpSize;
+#if defined(__GFX9__) || !defined(__HIP_DEVICE_COMPILE__)
+    return 64;
+#else
+    return 32;
+#endif
 }
 
 CK_TILE_DEVICE index_t get_grid_size() { return gridDim.x; }