Sync bounce pages support with the alpha backend. More precisely:

	o use a mutex to protect the bounce pages structure.
	o use a SYSINIT function to initialize the bounce pages structures
	  and thus avoid a race condition in alloc_bounce_pages().
	o add support for the BUS_DMA_NOWAIT flag in bus_dmamap_load().
	o remove obsolete splhigh()/splx() calls.
	o remove printf() about incorrect locking in busdma_swi() and sync
	  busdma_swi() with the one of the alpha backend.
	o use __FBSDID.

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