ACPI: GTDT: Parse information related to the EL2 virtual timer

ACPI: GTDT: Parse information related to the EL2 virtual timer

Now that we have a way to identify GTDTv3, allow the information
related to the EL2 virtual timer to be retrieved by the interface
used by the architected timer driver.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://patch.msgid.link/20260523140242.586031-3-maz@kernel.org