The 'bits' for the DAC_CSR register are currently defined as
enums. All the other registers use defines for the bit definitions.
Change the dac bit enums to defines to follow the other registers.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>