arm64: dts: stratix10: align regulator node names with dtschema

The devicetree specification requires that node name should be generic.
The dtschema complains if name does not match pattern, so make the
0.33 V regulator node name more generic.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>