arm64: paravirt: remove conduit check in has_pv_steal_clock

arm_smccc_1_1_invoke() which is called later on in the function
will return failure if there's no conduit (or pre-SMCCC 1.1),
hence the check is unnecessary.

Suggested-by: Steven Price <steven.price@arm.com>
Signed-off-by: Usama Arif <usama.arif@bytedance.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20221104061659.4116508-1-usama.arif@bytedance.com


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