allocations.ql: match kmalloc calls by attribute, not name

[artmetla]

Kernel's alloc-profiling rework renamed kmalloc/kzalloc/kvmalloc to *_noprof, breaking the name-based match. Identify calls via the __alloc_size attribute + gfp_t parameter instead, so the same query works on both old-name (e.g. 6.1) and *_noprof (6.12+) kernels, and survives future renames the same way.

Also:

• Drop the isAffectedByMacro() filter on the size arg. Every *_noprof call is now macro-wrapped (alloc_hooks()), so this filter would exclude every row; it also excluded struct_size()/array_size() allocations even before the rework, which is the flexible-array pattern this query is meant to find.
• Fix getStruct() producing duplicate rows when its two resolution branches (sizeof-based and pointer-cast fallback) both matched.