Added HALT_Z80_ON_DMA flag
Added HALT_Z80_ON_DMA flag

Added HALT_Z80_ON_DMA flag to fix issues on some hardware
clbr/SGDK,andwn/SGDK,clbr/SGDK,Stephane-D/SGDK,andwn/SGDK,andwn/SGDK,clbr/SGDK,Stephane-D/SGDK,clbr/SGDK,Stephane-D/SGDK