mfd: Add module.h to the implicit drivers/mfd users

With the pending module.h cleanup, these files will fail to compile,
unless they explicitly call out the include of this file.

[omap-usb-host addition courtesy of Anand Gadiyar <gadiyar@ti.com>]

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --cc drivers/mfd/ab3100-core.c
Simple merge

diff --cc drivers/mfd/ab3550-core.c
Simple merge

diff --cc drivers/mfd/ab8500-debugfs.c
Simple merge

diff --cc drivers/mfd/ab8500-sysctrl.c
Simple merge

diff --cc drivers/mfd/abx500-core.c
Simple merge

diff --cc drivers/mfd/dm355evm_msp.c
Simple merge

diff --cc drivers/mfd/max8997.c
Simple merge

diff --cc drivers/mfd/mfd-core.c
Simple merge

diff --cc drivers/mfd/twl-core.c
Simple merge

diff --cc drivers/mfd/wl1273-core.c
Simple merge

diff --cc drivers/mfd/wm8400-core.c
Simple merge