Include zynq clk header where init function is declared.

It removes this sparse warning:
drivers/clk/clk-zynq.c:373:13: warning: symbol
'xilinx_zynq_clocks_init' was not declared. Should it be static?
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Use common of_clk_init() function for clock initialization.
Signed-off-by: NPrashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-by: NJosh Cartwright <josh.cartwright@ni.com>
Tested-by: NJosh Cartwright <josh.cartwright@ni.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Provide simplified models for the necessary clocks on the zynq-7000
platform.  Currently, the PLLs, the CPU clock network, and the basic
peripheral clock networks (for SDIO, SMC, SPI, QSPI, UART) are modelled.

OF bindings are also provided and documented.
Signed-off-by: NJosh Cartwright <josh.cartwright@ni.com>
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: NMike Turquette <mturquette@linaro.org>
Acked-by: NMichal Simek <michal.simek@xilinx.com>