[SYCL] Fix unreferenced parameters (intel#10482)

This adds references to unused function parameters to avoid build
errors.

---------

Co-authored-by: Vyacheslav Klochkov <[email protected]>

Author: rdeodhar

sycl/plugins/esimd_emulator/pi_esimd_emulator.cpp

@@ -2045,11 +2045,13 @@ pi_result piextUSMGetMemAllocInfo(pi_context, const void *, pi_mem_alloc_info,
   DIE_NO_IMPLEMENTATION;
 }
 
-pi_result piextUSMImport(const void *ptr, size_t size, pi_context context) {
+pi_result piextUSMImport(const void *, size_t, pi_context) {
   return PI_SUCCESS;
 }
 
 pi_result piextUSMRelease(const void *ptr, pi_context context) {
+  (void)ptr;
+  (void)context;
   return PI_SUCCESS;
 }