clk: exynos: Add Samsung clock framework

Heavily based on Linux kernel Samsung clock framework, with some changes
to accommodate the differences in U-Boot CCF implementation. It's also
quite minimal as compared to the Linux version.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/drivers/clk/exynos/Makefile b/drivers/clk/exynos/Makefile
index 7faf238..04c5b9a 100644
--- a/drivers/clk/exynos/Makefile
+++ b/drivers/clk/exynos/Makefile
@@ -1,6 +1,11 @@
 # SPDX-License-Identifier: GPL-2.0+
 #
 # Copyright (C) 2016 Samsung Electronics
-# Thomas Abraham <thomas.ab@samsung.com>
+# Copyright (C) 2023 Linaro Ltd.
+#
+# Authors:
+#   Thomas Abraham <thomas.ab@samsung.com>
+#   Sam Protsenko <semen.protsenko@linaro.org>
 
-obj-$(CONFIG_CLK_EXYNOS7420)	+= clk-exynos7420.o
+obj-$(CONFIG_$(SPL_TPL_)CLK_CCF)	+= clk.o clk-pll.o
+obj-$(CONFIG_CLK_EXYNOS7420)		+= clk-exynos7420.o