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Cortex A78 AE erratum 1941500 is a Cat B erratum that applies
to revisions <= r0p1. It is still open.

This erratum is avoided by by setting CPUECTLR_EL1[8] to 1.
There is a small performance cost (<0.5%) for setting this
bit.

SDEN is available at https://developer.arm.com/documentation/SDEN1707912/0900



Change-Id: I2d72666468b146714a0340ba114ccf0f5165b39c
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>