[PATCH 3.12 26/72] serial: 8250_pci: Add support for 12 port Exar boards

From: Soeren Grunewald 3.12-stable review patch. If anyone has any objections, please let me know. === commit be32c0cf0462c36f482b5ddcff1d8371be1e183c upstream. The Exar XR17V358 can also be combined with a XR17V354 chip to act as a single 12 port chip. This works the same way as

[PATCH 3.12 26/72] serial: 8250_pci: Add support for 12 port Exar boards

From: Soeren Grunewald 3.12-stable review patch. If anyone has any objections, please let me know. === commit be32c0cf0462c36f482b5ddcff1d8371be1e183c upstream. The Exar XR17V358 can also be combined with a XR17V354 chip to act as a single 12 port chip.