dmaengine: altera-msgdma: Remove useless DMA-32 fallback configuration

dmaengine: altera-msgdma: Remove useless DMA-32 fallback configuration

As stated in [1], dma_set_mask() with a 64-bit mask never fails if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

Simplify code and remove some dead code accordingly.

[1]: https://lore.kernel.org/linux-kernel/YL3vSPK5DXTNvgdx@infradead.org/#t

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Stefan Roese <sr@denx.de>
Acked-by: Olivier Dautricourt <olivier.dautricourt@orolia.com>
Link: https://lore.kernel.org/r/01058ada3a0dea207212182ca7525060a204f1e1.1642232423.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul <vkoul@kernel.org>