i2c/busses: Use module_platform_driver()

Convert the drivers in drivers/i2c/busses/* to use the
module_platform_driver() macro which makes the code smaller and a bit
simpler.

Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: Jochen Friedrich <jochen@scram.de>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Yong Zhang <yong.zhang0@gmail.com>
Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --cc drivers/i2c/busses/i2c-at91.c
Simple merge

diff --cc drivers/i2c/busses/i2c-au1550.c
Simple merge

diff --cc drivers/i2c/busses/i2c-cpm.c
Simple merge

diff --cc drivers/i2c/busses/i2c-highlander.c
Simple merge

diff --cc drivers/i2c/busses/i2c-ibm_iic.c
Simple merge

diff --cc drivers/i2c/busses/i2c-iop3xx.c
Simple merge

diff --cc drivers/i2c/busses/i2c-isch.c
Simple merge

diff --cc drivers/i2c/busses/i2c-ixp2000.c
Simple merge

diff --cc drivers/i2c/busses/i2c-mpc.c
Simple merge

diff --cc drivers/i2c/busses/i2c-mv64xxx.c
Simple merge

diff --cc drivers/i2c/busses/i2c-ocores.c
Simple merge

diff --cc drivers/i2c/busses/i2c-octeon.c
Simple merge

diff --cc drivers/i2c/busses/i2c-pca-platform.c
Simple merge

diff --cc drivers/i2c/busses/i2c-pmcmsp.c
Simple merge

diff --cc drivers/i2c/busses/i2c-powermac.c
Simple merge

diff --cc drivers/i2c/busses/i2c-sh7760.c
Simple merge

diff --cc drivers/i2c/busses/i2c-simtec.c
Simple merge

diff --cc drivers/i2c/busses/i2c-xiic.c
Simple merge