drm/tyr: use IoMem directly instead of Devres

Now that IoMem is lifetime-parameterized, use it directly in probe
rather than wrapping it in Devres and Arc. The I/O memory mapping is
only used during probe and not stored in driver data, so device-managed
revocation is unnecessary.

This removes the Devres access(dev) pattern from issue_soft_reset(),
GpuInfo::new(), and l2_power_on(), simplifying register access.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Tested-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260529000106.2257996-3-dakr@kernel.org
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

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