clk: add Loongson1B clock support

This adds clock support to Loongson1B SoC using the common clock
infrastructure.

Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --cc drivers/clk/Makefile
Simple merge

diff --cc drivers/clk/clk-ls1x.c
Simple merge