fix(cpus): remove C1-Premium erratum 3651221

This erratum workaround is already implemented as part
of CVE-2024-7881 [1] and is redundant. This patch removes
C1-Premium erratum 3651221 [2] support.

[1] : https://developer.arm.com/documentation/110326/latest/
[2] : https://developer.arm.com/documentation/111078/latest/
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I40b37ec62788884ae5c0a0bb3eb4b924622ffe55