block: bfq: Squashed update from BFQ-v7r4 to BFQ-v7r5

Change-Id: I749ef141246db7020cec0b10d980ec854a572603
Merge pull request #2 from freexperia/cm-11.0

block: bfq: Squashed update from BFQ-v7r4 to BFQ-v7r5