Change LVM scripts to use /sbin/static/busybox

Patch set 2 of 2 depends on https://gerrit.omnirom.org/9474

This change updates LVM scripts to use /sbin/static/busybox
instead of using /sbin/busybox so that the static busybox does not
override the dynamic busybox included in TWRP recovery. This change
is needed to prevent errors when installing some zips that depend
on the busybox that is supplied by recovery.

Improve upon find7: LVM support Phase 3: Recovery bringup

Make LVM automatic handling actually work in recovery. This depends
on https://gerrit.omnirom.org/#/c/9477/ to work properly.

Change-Id: Ib94abaf5232cccc520bc9ec78cbac5bfb4f935c8