Fix builds with GCC 15

[krnowak]

What this PR does / why we need it:

GCC 15 has more cleanups done in their include files, which results in some declarations to be not indirectly brought into translation unit anymore.

In this case there were errors in prefetch.h header about uint32_t being undeclared. Let's include cstding header file to fix it.

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[krnowak]

This PR won't fix building overlaybd with gcc 15, because similar issue exists in photon 0.6.17, which overlaybd vendors. We currently are patching it in Flatcar.