When registering clk-si5351 by platform_data, we should not pass struct clk
for the reference clocks. Drop struct clk from platform_data and rework the
driver to use devm_clk_get of named clock references.

While at it, check for at least one valid input clock and properly prepare/
enable valid reference clocks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reported-by: NMichael Welling <mwelling@ieee.org>
Reported-by: NJean-Francois Moine <moinejf@free.fr>
Reported-by: NRussell King <rmk+linux@arm.linux.org.uk>
Tested-by: NMichael Welling <mwelling@ieee.org>
Tested-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMichael Turquette <mturquette@linaro.org>