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GH-37849: [C++] Add cpp/src/**/*.cmake to cmake-format targets (#37850)

### Rationale for this change

In general, all our `.cmake` files should be `cmake-format` targets.

### What changes are included in this PR?

Add missing patterns for `cpp/src/**/*.cmake`.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #37849

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>