This overhauls most of the code to be easier to understand in terms
of the interactions with the flash. I found the original to be rather
confusing with how it kept switching between byte and word offsets.
My solution was to make all external access to the flash in terms of
sectors and bytes. Whatever the flash uses internally is now handled
by the subroutines for performing the erase, program, and verify
operations.
This helps make it far more consistent for the code that actually uses
these operations as they do not need to concern themselves with word
sizes and offsets anymore.
As a side effect of this change the flash operations are now done
entirely by subroutines; even the batch operations that used to use
custom loops.
Additionally some functions were merged with other functions in order
to reduce the amount of functions as well as consolidating common
code fragments.
Change-Id: I4698e920a226a3bbe8070004a14e5848abdd70ec
4aa749b59d