ASoC/dts: OMAP2+: AM33xx: [HACK] Add missing dma info

    This patch adds dma related  dt entries and functions that later will be
    replaced by actual DMA porting

    Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>