clk: qcom: Add missing SYSTEM_MM_NOC_BFDCD_CLK_SRC

When adding in the indexes for this clock-controller we missed
SYSTEM_MM_NOC_BFDCD_CLK_SRC.

Add it in now.

Fixes: 4c71d6ab ("clk: qcom: Add DT bindings for MSM8939 GCC")
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: devicetree@vger.kernel.org
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>