Having the twrp_dd module definition right within the build rules
for the toolbox symlinks causes the toolbox tools (getprop, ...)
to be linked to dd instead of toolbox.
This happens because the symlinks are created using variables
from the "toolbox_recovery" module (e.g. LOCAL_MODULE_STEM).
Those are changed by the twrp_dd module definition.
Move the twrp_dd module definition to the end of the make file
(after the build rules for the symlinks) to fix this.
Fixes https://github.com/omnirom/android_bootable_recovery/issues/257
Change-Id: I44973920898fe8a21bc32d621500fe38f9d1ebdd