arm64: cpufeature: Pass capability structure to ->enable callback

In order to invoke the CPU capability ->matches callback from the ->enable
callback for applying local-CPU workarounds, we need a handle on the
capability structure.

This patch passes a pointer to the capability structure to the ->enable
callback.

Change-Id: I5f83f1002dd35a4a8f77abe8d0204cef96c37398
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 0a0d111d40fd1dc588cc590fab6b55d86ddc71d3
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux


[neeraju@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>