arm64: compat: Remove 32-bit sigreturn code from the vDSO

The sigreturn code in the compat vDSO is unused. Remove it.

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>