Revert "MIPS: Loongson64: Enable DMA noncoherent support"

This reverts commit 3ee7e2fa which is
commit edc0378e

 upstream.

There are reports of this causing build issues, so revert it from the
5.10.y tree for now.

Reported-by: Salvatore Bonaccorso <carnil@debian.org>
Link: https://lore.kernel.org/r/ZZE1X8m5PXJExffG@eldamar.lan
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>