qcom_gcc: migrate the MSM8916 support to qcom_gcc

* migrate the MSM8916 (snapdragon 410) support to qcom_gcc
* add the full qcom_gcc / qcom_clk list to files.arm64, replacing
the MSM8916 stub in s

qcom_gcc: migrate the MSM8916 support to qcom_gcc

* migrate the MSM8916 (snapdragon 410) support to qcom_gcc
* add the full qcom_gcc / qcom_clk list to files.arm64, replacing
the MSM8916 stub in sys/arm64/qualcomm .

Differential Revision: https://reviews.freebsd.org/D49706

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