clk: Add MPC83xx clock driver

Add a clock driver for the MPC83xx architecture.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 809eb3d..c996d65 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -107,4 +107,10 @@
 	  Crystal Oscillator). The output frequency can be programmed via an
 	  I2C interface.
 
+config CLK_MPC83XX
+	bool "Enable MPC83xx clock driver"
+	depends on CLK
+	help
+	  Support for the clock driver of the MPC83xx series of SoCs.
+
 endmenu