dmaengine fixes for v5.7-rc4

Core:
 - Documentation typo fixes
 - fix the channel indexes
 - Dmatest: fixes for process hang and iterations
Drivers:
 - hisilicon: build error fix without PCI_MSI
 - ti-k3: deadlock fix
 - uniphier-xdmac: fix for reg region
 - pch: fix data race
 - tegra: fix clock state
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