dmaengine: sh: rz-dmac: Use rz_lmdesc_setup() to invalidate descriptors

rz_lmdesc_setup() invalidates DMA descriptors more comprehensively.
It resets the base, head, and tail pointers of the descriptor list and
clears the descriptor headers and their NXLA pointers. Use
rz_lmdesc_setup() instead of open-coding parts of its logic.

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260316133252.240348-7-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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