dmaengine: idxd: fix wq cleanup of WQCFG registers

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: fix wq cleanup of WQCFG registers

A pre-release silicon erratum workaround where wq reset does not clear

WQCFG registers was leaked into upstream code. Use wq reset command

instead of blasting the MMIO region. This also address an issue where

we clobber registers in future devices.