Apply and fix clang-tidy on aptx and aptxhd

system/embdrv/encoder_for_aptx/src/CodewordPacker.h

system/embdrv/encoder_for_aptx/src/QmfConv.c

system/embdrv/encoder_for_aptx/src/QuantiseDifference.c

system/embdrv/encoder_for_aptx/src/SubbandFunctions.h

system/embdrv/encoder_for_aptx/src/aptXbtenc.c

system/embdrv/encoder_for_aptxhd/src/QmfConv.c

system/embdrv/encoder_for_aptxhd/src/QuantiseDifference.c

system/embdrv/encoder_for_aptxhd/src/SubbandFunctions.h

system/embdrv/encoder_for_aptxhd/src/aptXHDbtenc.c