iommu: qcom-smmu: fix debugging

The priv struct was wrong in dump_boot_mappings(). Causing errors when
compiling with -DDEBUG. Fix this.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20240320-b4-qcom-usb-v4-5-41be480172e1@linaro.org


Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>