Multi-TU drivers produce PLT32 for cross-object calls (lld keeps a
relocation for potentially-interposable global symbols). ath9k.drv
(ath9k.o + wpa2_crypto.o) has 22 such relocations, which tripped
"DKM-E37 UNSUPPORTED RELOCATION" at boot.
PLT32 has the same semantics as PC32 in a static relocatable
(patch = S + A - P), and is a 4-byte write. Added the constant, the
patch computation, and switched the write-width branch to
"not R_X86_64_64 -> u32" so all 4-byte types are handled uniformly.
Verified: all 28 .drv files now use only
{R_X86_64_32S, R_X86_64_64, R_X86_64_PC32, R_X86_64_PLT32}.
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