The existing qcom_nand driver supports ADM DMA which is mainly
required for ipq806x family based boards,
IPQ40xx based boards uses BAM DMA in NAND driver, so this patch
adds BAM DMA support with compatible string as qcom,ebi2-nandc-bam.
Signed-off-by: Ram Chandra Jangir <rjangir@codeaurora.org>