mips: provide unxlate_dev_mem_ptr() in asm/io.h
The unxlate_dev_mem_ptr() function has no prototype on the mips
architecture, which does not include asm-generic/io.h, so gcc warns
about the __weak definition:
drivers/char/mem.c:94:29: error: no previous prototype for 'unxlate_dev_mem_ptr' [-Werror=missing-prototypes]
Since everyone else already gets the generic definition or has a custom
one, there is not really much point in having a __weak version as well.
Remove this one, and instead add a trivial macro to the mips header.
Once we convert mips to use the asm-generic header, this can go away
again.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>