ARM: keystone: rename clk_get_rate() to ks_clk_get_rate()

The KeyStone platform has its own clk_get_rate() but its prototype
is different from that of the common-clk (clk-uclass) framework.

Prefix the KeyStone specific implementation with ks_ in order to
avoid name-space conflict.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-keystone/cmd_clock.c b/arch/arm/mach-keystone/cmd_clock.c
index 3d5cf3f..06afa72 100644
--- a/arch/arm/mach-keystone/cmd_clock.c
+++ b/arch/arm/mach-keystone/cmd_clock.c
@@ -74,7 +74,7 @@
 
 	clk = simple_strtoul(argv[1], NULL, 10);
 
-	freq = clk_get_rate(clk);
+	freq = ks_clk_get_rate(clk);
 	if (freq)
 		printf("clock index [%d] - frequency %lu\n", clk, freq);
 	else