Guard HIP macro against redefinition (#21061)

This is necessary for IREE to be built against the tracy with rocprof
fork. The rocprof cmake module defines this macro; causing a
redefinition error in IREE.

Signed-off-by: Eric Eaton <[email protected]>

Author: erieaton-amd

runtime/src/iree/hal/drivers/hip/hip_headers.h

@@ -11,7 +11,10 @@
 #error "32-bit not supported on HIP backend"
 #endif  // defined(IREE_PTR_SIZE_32)
 
+#if !defined(__HIP_PLATFORM_AMD__)
 #define __HIP_PLATFORM_AMD__
+#endif
+
 // Order matters here--hip_deprecated.h depends on hip_runtime_api.h. So turn
 // off clang-format.
 //