clk: ti: Constify clkctrl_name

We can constify clkctrl_name in preparation for making use of the
clock-output-names property.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20220204071449.16762-2-tony@atomide.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/ti/clkctrl.c

@@ -505,7 +505,7 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 	struct omap_clkctrl_clk *clkctrl_clk = NULL;
 	const __be32 *addrp;
 	bool legacy_naming;
-	char *clkctrl_name;
+	const char *clkctrl_name;
 	u32 addr;
 	int ret;
 	char *c;