spi: spi_qsd: Modify bus bandwidth voting

Modify the bus bandwidth voting vectors to remove the AB part.
The AB portions are not needed for SPI usescases as these add to
the latency of the transactions and in general AB is not needed for
smaller bus bandwidth requests like the requests from SPI driver.

Remove the use of the "active-only" field in the driver and the
logic it was driving in terms of bus voting scheme. The active-only
scheme should only be used if needed to vote for bus badwidth when
AP is active and it doesn't apply to SPI usecases.

Change-Id: I4c62cce9d1c7e32d57bc6367e0e5fbdf44261f6d
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>