Add bge(4) support for big-endian architectures(part 1/2).

 - Give up endianess support and switch to native-endian format for
   accessing hardware structures. In fact embedded processor for
   BCM57xx is big-endian architure(MIPS) and it requires native-endian
   format for NIC structures.The NIC performs necessary byte/word
   swapping depending on programmed endian type.
 - With above changes all htole16/htole32 calls were gone.
 - Remove bge_vhandle member in softc and changed to use explicit
   register access. This may add additional performance penalty
   that than that of previous memory access. But most of the access
   is performed on initialization phase(e.g. RCB setup), it would be
   negligible.

Due to incorrect use of bus_dma(9) in bge(4) it still panics sparc64
system in device detach path. The issue would be fixed in next patch.

Reviewed by:	jkim (initial version)
Silence from:	ps
Tested by:	glebius
Obtained from:	NetBSD via OpenBSD

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