Add arm64 processor support to CE doc

[hjiawei]

Calico Enterprise will support arm64 processor from CE v3.19 EP2.

Product Version(s):

Calico Enterprise v3.19 EP2+.

Issue:

Link to docs preview:

SME review:

• An SME has approved this change.

DOCS review:

• A member of the docs team has approved this change.

Additional information:

Merge checklist:

• Deploy preview inspected wherever changes were made
• Build completed successfully
• Test have passed

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[ctauchen]

LGTM, thanks