clk: st: clk-flexgen: Detect critical clocks

Utilise the new Critical Clock infrastructure to mark clocks which
much not be disabled as CRITICAL.

While we're at it, reduce the coverage of the flex_flags variable,
since it's only really used in a single for() loop.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c
index 627267c..546bd79 100644
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -267,7 +267,6 @@
 	const char **parents;
 	int num_parents, i;
 	spinlock_t *rlock = NULL;
-	unsigned long flex_flags = 0;
 	int ret;
 
 	pnode = of_get_parent(np);
@@ -308,12 +307,15 @@
 	for (i = 0; i < clk_data->clk_num; i++) {
 		struct clk *clk;
 		const char *clk_name;
+		unsigned long flex_flags = 0;
 
 		if (of_property_read_string_index(np, "clock-output-names",
 						  i, &clk_name)) {
 			break;
 		}
 
+		of_clk_detect_critical(np, i, &flex_flags);
+
 		/*
 		 * If we read an empty clock name then the output is unused
 		 */