mips/netlogic: remove swiotlb support

nlm_swiotlb_dma_ops is unused code, so the whole swiotlb support is dead.
If it gets resurrected at some point it should use the generic
swiotlb_dma_ops instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian König <christian.koenig@amd.com>

arch/mips/netlogic/common/Makefile

@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-y				+= irq.o time.o
-obj-y				+= nlm-dma.o
 obj-y				+= reset.o
 obj-$(CONFIG_SMP)		+= smp.o smpboot.o
 obj-$(CONFIG_EARLY_PRINTK)	+= earlycons.o