iio: pressure: zpa2326: Use aligned_s64 for the timestamp

On x86_32 s64 fields are only 32-bit aligned.  Hence force the alignment of
the field and padding in the structure by using aligned_s64 instead.

Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250413103443.2420727-19-jic23@kernel.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>