dm: clk: add BCM6345 clock driver

This is a simplified version of linux/arch/mips/bcm63xx/clk.c

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 5ca958c..44da716 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -20,6 +20,14 @@
 	  setting up clocks within SPL, and allows the same drivers to be
 	  used as U-Boot proper.
 
+config CLK_BCM6345
+	bool "Clock controller driver for BCM6345"
+	depends on CLK && ARCH_BMIPS
+	default y
+	help
+	  This clock driver adds support for enabling and disabling peripheral
+	  clocks on BCM6345 SoCs. HW has no rate changing capabilities.
+
 config CLK_BOSTON
 	def_bool y if TARGET_BOSTON
 	depends on CLK