Import and enable Ultra KSM driver.

vm.swappiness is no longer set by the init.rc script; manually set a value using init.d. Recommended vm.swappiness values are between 20 and 40.

Update and enable ZRAM driver.

This release also comes with Busybox 1.31.0; it's stored under the /sbin directory.
Note that Toybox's insmod program is unable to load modules and, therefore, Busybox's insmod program has to be used.