clk: si5351: make clk-si5351 depend on CONFIG_OF

Calling clk-si5351 driver non-OF ready was too early. This patch
makes clk-si5351 depend on CONFIG_OF again, until things get sorted out.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
[mturquette@linaro.org: fixed spelling of Stephen's name]

drivers/clk/Kconfig

@@ -58,6 +58,7 @@ config COMMON_CLK_MAX77686
 config COMMON_CLK_SI5351
 	tristate "Clock driver for SiLabs 5351A/B/C"
 	depends on I2C
+	depends on OF
 	select REGMAP_I2C
 	select RATIONAL
 	---help---