m7-common: clean up deprecated custom recovery graphics

Change-Id: Ib29bcf571a6c572bc480cc3cc19daa522004329b
m7-common: use by-name paths for partitions in fstab

Change-Id: I0575efd29d31359ca9243e8967e919b509776575
m7-common: remove unused AudioBTID files

These seem to only be used by msm8660/msm7x30 in audio-caf.

Change-Id: Ia5b0aa76febe7ce491d63ad7a590d90665385bad
m7-common: fix breakfast sync error if no vendor

Let breakfast retrieve repositories without error if vendor is not yet
populated (which for most users it should not be, as the extract scripts
have not yet been run).

Change-Id: I34650c8c41b9bb6ff501d60fd9ec91b546297d8f
Merge " m7-common: clean up deprecated custom recovery graphics" into kk4.4
Merge "m7-common: use by-name paths for partitions in fstab" into kk4.4
Merge changes I34650c8c,Ia5b0aa76 into kk4.4

* changes:
  m7-common: fix breakfast sync error if no vendor
  m7-common: remove unused AudioBTID files