dt-bindings: nvmem: Add SoC compatible for sm6115

Document SoC compatible for sm6115.

Reviewed-by: Caleb Connolly <caleb@connolly.tech>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220916122100.170016-10-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>