ARM: tegra: dma: rename driver name for clock to "tegra-apbdma"

Rename the driver name of the clock entry of Tegra APBDMA to
tegra-apbdma from of tegra-dma.

This name is more aligned towards the movement of dmaengine based
new DMA driver.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>