tools: PCI: Fix incorrect printf format specifiers

Fix several incorrect printf format specifiers that misused signed and
unsigned versions.

Link: https://lore.kernel.org/r/20241112090924.287056-1-luoyifan@cmss.chinamobile.com


Signed-off-by: Luo Yifan <luoyifan@cmss.chinamobile.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>