Copy wifi_hidl_call_util.h for supplicant VTS test

This copies wifi_hidl_call_util.h to supplicant cts directory
so supplicant vts tests can use this to simplify code.

Bug: 33457575
Test: compile, manual test
Change-Id: I696475062d04d54fafae5c3323818ce1d1ff7d9d
1 file changed