clk: ti: dra7x: prevent non-existing clkctrl clocks from registering

Certain clkctrl clocks (like the USB_OTG_SS4) do not exist on some
variants of the dra7x SoC. Append a flag for these clocks and skip
the registration in cases where the clocks do not exist.

Reported-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/ti/clock.h

@@ -83,6 +83,12 @@ enum {
 #define CLKF_HW_SUP			BIT(6)
 #define CLKF_NO_IDLEST			BIT(7)
 
+#define CLKF_SOC_MASK			GENMASK(10, 8)
+
+#define CLKF_SOC_DRA72			BIT(8)
+#define CLKF_SOC_DRA74			BIT(9)
+#define CLKF_SOC_DRA76			BIT(10)
+
 #define CLK(dev, con, ck)		\
 	{				\
 		.lk = {			\