firmware: smccc: Support both smc and hvc conduits for getting hyp UUID

firmware: smccc: Support both smc and hvc conduits for getting hyp UUID

When Linux is running as the root partition under Microsoft Hypervisor
(MSHV) a.k.a Hyper-V, smc is used as the conduit for smc calls.

Extend arm_smccc_hypervisor_has_uuid() to support this usecase. Use
arm_smccc_1_1_invoke to retrieve and use the appropriate conduit instead
of supporting only hvc.

Boot tested on MSHV guest, MSHV root & KVM guest.

Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Roman Kisel <romank@linux.microsoft.com>
Message-Id: <20250521094049.960056-1-anirudh@anirudhrb.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>