Dragonboard 820c - fix board support

[Jorge Ramirez-Ortiz]

This series addresses the existing issues with U-Boot support for the
DragonBoard 820c.

[PATCH 1/7] board: qualcomm: dragonboard820c: udpate readme
[PATCH 2/7] clk/qcom: apq8096: fix set rate for the uart clock
[PATCH 3/7] mmc: msm_sdhci: handle bulk clock initialization error
[PATCH 4/7] clk/qcom: apq8096: fix the sdhci clock
[PATCH 5/7] configs: dragonboard820: enable GPIO
[PATCH 6/7] mach-snapdragon: board interface to enforce fdt
[PATCH 7/7] board: qualcommm: dragonboard820c: external fdt