m7-common: Add "length" parameter for /data partition

* Required for "footer" style encryption.

Change-Id: I6ba9f37816097531a4668e6c58998e0400ea3d06
m7-common: Fix USB charge mode

* Switch to using lpm.rc
* Update charge mode binaries
* Add charger image resources

Change-Id: I79efb86155c61d6eb25dd1d41fae2a27167dcb47