[linux-6.6.y] Fix built errors of Zhaoxin DMA patches for i386

[leoliu-oc]

After merging d3eb024 ("Add kh40000_direct_dma_ops for KH-40000 platform"), builting with i386_defconfig, built errors occurred due to differences in configuration items:
ld:arch/x86/kernel/early-quirks.o: in function `quirk_zhaoxin_dma_patch': early-quirks.c:(.text+0x2b): undefined reference to kh40000_dma_direct_ops

Therefore, modified the conditionanl items related to the code and encapsulated the sturct pointer assignment into function.

Fixes: d3eb024 ("Add kh40000_direct_dma_ops for KH-40000 platform")

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