clk: boston: Providea simple driver for Boston board clocks

Add a simple driver for the clocks provided by the MIPS Boston
development board. The system provides information about 2 clocks whose
rates are fixed by the bitfile flashed in the boards FPGA, and this
driver simply reads the rates of these 2 clocks.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 778d748..40a5e8c 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -15,3 +15,4 @@
 obj-$(CONFIG_CLK_UNIPHIER) += uniphier/
 obj-$(CONFIG_CLK_EXYNOS) += exynos/
 obj-$(CONFIG_CLK_AT91) += at91/
+obj-$(CONFIG_CLK_BOSTON) += clk_boston.o