dt-bindings: nvmem: Add compatible for MSM8960

Document the QFPROM on MSM8960.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rudraksha Gupta <guptarud@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>