arm64: vdso32: Remove unused vdso32-offsets.h

Commit 2d071968 ("arm64: compat: Remove 32-bit sigreturn code
from the vDSO") removed all VDSO_* symbols in the compat vDSO. As a
result, vdso32-offsets.h is now empty and therefore unused. Time to
remove it.

Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Link: https://lore.kernel.org/r/20240129154748.1727759-1-kevin.brodsky@arm.com


Signed-off-by: Will Deacon <will@kernel.org>