Gate off ENFC clock before setting clock rate

Dmitry Lavnikevich d.lavnikevich at
Fri Nov 21 05:35:05 PST 2014

Since last revision hardcoded manipulations with clock registers was
replaced with clk_disable/clk_enable calls.

For this purpose 2-bit gate clocks support was implemented for imx platform
(like it is done in current mainline kernel code) and enfc_gate 2-bit gate
clock was added in clk-imx.

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