enable another l2 cache errate on newer kernels

SVN-Revision: 30472

target/linux/cns3xxx/config-default

@@ -121,6 +121,7 @@ CONFIG_PERF_USE_VMALLOC=y
 CONFIG_PHYLIB=y
 CONFIG_PL310_ERRATA_588369=y
 CONFIG_PL310_ERRATA_727915=y
+CONFIG_PL310_ERRATA_769419=y
 # CONFIG_PREEMPT_RCU is not set
 # CONFIG_QUOTACTL is not set
 CONFIG_RAID_ATTRS=y