fix(px30): remove unused function

clang complains about it and refuses to build otherwise, so let's remove
this seemingly unused function.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Change-Id: Ifdf42308a76e8990e08f504fa58989d4cac7e434
diff --git a/plat/rockchip/px30/drivers/pmu/pmu.c b/plat/rockchip/px30/drivers/pmu/pmu.c
index 8770b2e..0d8e8b6 100644
--- a/plat/rockchip/px30/drivers/pmu/pmu.c
+++ b/plat/rockchip/px30/drivers/pmu/pmu.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2024, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -867,18 +867,6 @@
 		ERROR("Can't wait pll:%d lock\n", pll_id);
 }
 
-static inline void pll_pwr_ctr(uint32_t pll_base, uint32_t pll_id, uint32_t pd)
-{
-	mmio_write_32(pll_base + PLL_CON(1),
-		      BITS_WITH_WMASK(1, 1U, 15));
-	if (pd)
-		mmio_write_32(pll_base + PLL_CON(1),
-			      BITS_WITH_WMASK(1, 1, 14));
-	else
-		mmio_write_32(pll_base + PLL_CON(1),
-			      BITS_WITH_WMASK(0, 1, 14));
-}
-
 static inline void pll_set_mode(uint32_t pll_id, uint32_t mode)
 {
 	uint32_t val = BITS_WITH_WMASK(mode, 0x3, PLL_MODE_SHIFT(pll_id));