ARM: imx6: use common of_clk_init() call to initialize clocks

Instead of explicitly calling clock initialization functions, we can
declare the functions with CLK_OF_DECLARE() and then call common
of_clk_init() to have them invoked properly.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

diff --cc arch/arm/mach-imx/clk-imx6q.c
Simple merge

diff --cc arch/arm/mach-imx/clk-imx6sl.c
Simple merge

diff --cc arch/arm/mach-imx/common.h
Simple merge

diff --cc arch/arm/mach-imx/mach-imx6q.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx6sl.c
Simple merge