soc: ti: k3-ringacc: Use correct error casting in k3_ringacc_dmarings_init

Use ERR_CAST() when devm_ioremap_resource() fails.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201214065421.5138-1-peter.ujfalusi@ti.com


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