dmaengine: tegra210-adma: Add description for 'adma_get_burst_config'

Trivial change to add description for 'adma_get_burst_config' in chip
data structure.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/1631722025-19873-3-git-send-email-spujar@nvidia.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>