brcm80211 build busted on big-endian

[David Miller]

It tries to do "xor" operations on pointers because of how the
R_REG() and W_REG() macros are defined.

====================
#define R_REG(r) (\
        SELECT_BUS_READ( \
                ({ \
                        __typeof(*(r)) __osl_v; \
				       		switch (sizeof(*(r))) { \
                        case sizeof(u8): \
                                __osl_v = \
                                readb((volatile u8*)((r)^3)); \
                                break; \
                        case sizeof(u16): \
                                __osl_v = \
                                readw((volatile u16*)((r)^2)); \
                                break; \
                        case sizeof(u32): \
                                __osl_v = readl((volatile u32*)(r)); \
                                break; \
                        } \
                        __osl_v; \
                }), \
                OSL_READ_REG(r)) \
)
====================

This driver is a crap fest of volatile pointers and not-compile-tested
code.

I think turning on staging like this should have been done in the
-next tree so that things like this could be shaken out before it hit
Linus's tree.  Very few people were doing the necessary forced enable
of this stuff.
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