XSCALE_CACHE_ERRATA doesn't exist in Kconfig, therefore removing all
references for it from the source code.
Signed-off-by: NChristoph Egger <siccegge@cs.fau.de>
Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: NEric Miao <eric.y.miao@gmail.com>