[SYCLBIN] Fix size_t type narrowing (#19898)
When building on 32-bit build configurations, SYCLBIN.cpp would require
inexplicit type narrowing from uint64_t to size_t. This commit fixes the
type narrowing issues.
Fixes https://github.com/intel/llvm/issues/19891.
Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>
