board/freescale/common:QIXIS:Fix magic number usage

QIXIS FPGA layout defines the  address of registers but The actual register bit
implementation is board-specific,

So avoid use of magic numbers as it may vary across different boards's QIXIS
FPGA implementation.
Also, Avoid board specific defines in common/qixis.h

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
2 files changed