[scudo][standalone] Define hasHardwareCRC32 for other archs

Summary:
The function was only defined for x86 and arm families, which ends
up being an issue for PPC in g3.

Define the function, simply returning `false` for "other"
architectures.

Reviewers: hctim, pcc, cferris, eugenis, vitalybuka

Subscribers: kristof.beyls, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D71223