• Add support for Advantech PCI-1602 Rev. B1 and PCI-1603 cards. [1]
• Add a description of Advantech PCI-1602 Rev. A boards. [1]
• Properly set up REG_ACR also for PCI-1602 Rev. A based on what the Advantech-supplied Linux driver does.
• Additionally use the macros of <dev/ic/ns16550.h> to replace existing magic values and get rid of trivial comments.
• Fix the style of some comments.

PR: 205359 [1]
Submitted by: Jan Mikkelsen (original patch) [1]