ACPI: GTDT: Relax sanity checking on Platform Timers array count

ACPI: GTDT: Relax sanity checking on Platform Timers array count

Perhaps unsurprisingly there are some platforms where the GTDT isn't
quite right and the Platforms Timer array overflows the length of the
overall table.

While the recently-added sanity checking isn't wrong, it makes it
impossible to boot the kernel on offending platforms. Try to hobble
along and limit the Platform Timer count to the bounds of the table.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Zheng Zengkai <zhengzengkai@huawei.com>
Cc: stable@vger.kernel.org
Fixes: 263e22d6bd1f ("ACPI: GTDT: Tighten the check for the array of platform timer structures")
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Link: https://lore.kernel.org/r/20250128001749.3132656-1-oliver.upton@linux.dev
Signed-off-by: Will Deacon <will@kernel.org>