clk: imx: clk-pllv3: fix incorrect handle of enet powerdown bit

BugLink: https://bugs.launchpad.net/bugs/1878232

commit b3e76bdc upstream.

After commit f5394745 ("ARM: clk: imx: update pllv3 to support imx7"),
the former used BM_PLL_POWER bit is not correct anymore for IMX7 ENET.
Instead, pll->powerdown holds the correct bit, so using powerdown bit
in clk_pllv3_{prepare | unprepare} functions.

Fixes: f5394745 ("ARM: clk: imx: update pllv3 to support imx7")
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/clk/imx/clk-pllv3.c

@@ -76,9 +76,9 @@ static int clk_pllv3_prepare(struct clk_hw *hw)
 
 	val = readl_relaxed(pll->base);
 	if (pll->powerup_set)
-		val |= BM_PLL_POWER;
+		val |= pll->powerdown;
 	else
-		val &= ~BM_PLL_POWER;
+		val &= ~pll->powerdown;
 	writel_relaxed(val, pll->base);
 
 	return clk_pllv3_wait_lock(pll);
@@ -91,9 +91,9 @@ static void clk_pllv3_unprepare(struct clk_hw *hw)
 
 	val = readl_relaxed(pll->base);
 	if (pll->powerup_set)
-		val &= ~BM_PLL_POWER;
+		val &= ~pll->powerdown;
 	else
-		val |= BM_PLL_POWER;
+		val |= pll->powerdown;
 	writel_relaxed(val, pll->base);
 }