Modules: add the '-fno-pic' cflag

This cflag is needed by some toolchains.
it was the cause of the bcmdhd.ko wifi
module to print errors and not
insmod.

<4>[   19.753540] bcmdhd: Unknown symbol _GLOBAL_OFFSET_TABLE_ (err 0)

This cflag should not be used in the main kernel
however, as it will cause the kenrel to hang and
not boot