fix(errata): workarounds for cortex-x1 errata

This patch adds workarounds for following cortex-x1 errata:

- 1821534 (CatB)
- 1688305 (CatB)
- 1827429 (CatB)

SDEN can be found here:
https://developer.arm.com/documentation/SDEN1401782/latest

Signed-off-by: Okash Khawaja <okash@google.com>
Change-Id: I10ebe8d5c56a6d273820bb2c682f21bf98daa7a5
4 files changed