s/attachement/attachment/ and s/detachement/detachment/.

Add a flags argument to gcscpcib_attach().
Add a flag argument which cause the waychdog to not be attached.
Use it to disable the watchdog on loongson-based platforms, where
the CS5536's reset output

Add a flags argument to gcscpcib_attach().
Add a flag argument which cause the waychdog to not be attached.
Use it to disable the watchdog on loongson-based platforms, where
the CS5536's reset output is not wired to the CPU reset line :(

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Split gcscpcib into MI part, and MD pci attachement which is also in
charge of attaching the MD pcib device.
Will be used by the upcoming evbmips loongson support.