MAINTAINERS: idxd driver maintainer update

Add Fenghua as maintainer of the idxd driver.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20220615232651.177098-1-fenghua.yu@intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>