i2c: fix build bug in i2c-designware.c

This build error triggers on x86:

drivers/built-in.o: In function `i2c_dw_init':
i2c-designware.c:(.text+0x4e37ca): undefined reference to `clk_get_rate'
drivers/built-in.o: In function `dw_i2c_probe':
i2c-designware.c:(.devinit.text+0x51f5e): undefined reference to `clk_get'
i2c-designware.c:(.devinit.text+0x51f76): undefined reference to `clk_enable'
i2c-designware.c:(.devinit.text+0x520ff): undefined reference to `clk_disable'
i2c-designware.c:(.devinit.text+0x52108): undefined reference to `clk_put'

Because this new driver uses the clk_*() facilities which is an
ARM-only thing currently.

Signed-off-by: Ingo Molnar <[e-mail]>
Acked-by: Baruch Siach <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/i2c/busses/Kconfig

···
 
 config I2C_DESIGNWARE
 	tristate "Synopsys DesignWare"
+	depends on HAVE_CLK
 	help
 	  If you say yes to this option, support will be included for the
 	  Synopsys DesignWare I2C adapter. Only master mode is supported.