dmaengine: bestcomm: Code cleanup for bcom_sram_init

This part was commented from commit 2f9ea1bd ("[POWERPC]
bestcomm: core bestcomm support for Freescale MPC5200") in
about 16 years before.

If there are no plans to enable this part code in the future,
we can remove this dead code.

Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Link: https://lore.kernel.org/r/20240124095502.480506-1-chentao@kylinos.cn


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