Revert "module: make module param bint handle nul value"

This reverts commit 9471233fca4eff2f5c497ee3e1747a652ff851bd.
Revert "There is no /sys/parameters"

This reverts commit 953fe6e6578121a48f732649fce73d2e33e3e237.
Revert "params: Fix potential memory leak in add_sysfs_param()"

This reverts commit 5ef421f0cd46b11442430ef80697836b0a5bb292.
Revert "params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)"

This reverts commit bf5c71b7c2cae01bf82f717cf934230574a93279.