clk: davinci: pll-dm646x: keep PLL2 SYSCLK1 always enabled

PLL2 SYSCLK1 on DM646x is connected to DDR2 PHY and cannot
be disabled. Mark it so to prevent unused clock disable
infrastructure from disabling it.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: David Lechner <david@lechnology.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20180525181150.17873-5-david@lechnology.com

drivers/clk/davinci/pll-dm646x.c

@@ -72,7 +72,7 @@ static const struct davinci_pll_clk_info dm646x_pll2_info = {
 	.flags = 0,
 };
 
-SYSCLK(1, pll2_sysclk1, pll2_pllen, 4, 0);
+SYSCLK(1, pll2_sysclk1, pll2_pllen, 4, SYSCLK_ALWAYS_ENABLED);
 
 int dm646x_pll2_init(struct device *dev, void __iomem *base)
 {