Revert "n_tty: Fix n_tty_write crash when echoing in raw mode"

This reverts commit 5f71c1a2dd493564645557114043e65fbe32d492.
It causes a compiler error and Android is not vulnerable to CVE-2014-0196 anyway.
defconfig: Device count and IO scheduler changes

 - Lowered amount of default LOOP and RAM devices
 - Make IOSCHED_TEST a module again
 - Set default IO scheduler to "noop"