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When U-Boot as running as the first stage bootloader on MSM8916 devices, early debug UART requires turning on the clocks (for some reason the pre-loader turns them off?!). To simplify developing for this platform, allow the apq8016_clk_init_uart() function to be called externally. Developers can call this from the serial_msm debug uart driver to configure the clocks before the driver model is available. As it is only possible to enable early debug UART in custom builds of U-Boot, this solution at least gives developers the option. Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>