arch: arm64: Add midr values for kryo2xx big cores

Add midr value for kryo2xx big cores to apply errata workarounds for
branch prediction hardening.

Change-Id: I7ca9cfa3e6b48d5af78a5297cb76ebe6f52e519e
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
[gkohli@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>