rockchip: remove the hard coded uart iomux setting for px5 evb

As the debug uart is marked as dm-pre-reloc, the pinctrl driver
will handle the correct iomux setting.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/rockchip/evb_px5/evb-px5.c

@@ -4,30 +4,6 @@
  * SPDX-License-Identifier:     GPL-2.0+
  */
 #include <common.h>
-#include <asm/io.h>
-#include <fdtdec.h>
-#include <asm/arch/clock.h>
-#include <asm/arch/grf_rk3368.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-int mach_cpu_init(void)
-{
-	struct rk3368_pmu_grf *pmugrf;
-	int node;
-
-	node = fdt_node_offset_by_compatible(gd->fdt_blob, -1, "rockchip,rk3368-pmugrf");
-	pmugrf = (struct rk3368_pmu_grf *)fdtdec_get_addr(gd->fdt_blob, node, "reg");
-
-	rk_clrsetreg(&pmugrf->gpio0d_iomux,
-		     GPIO0D0_MASK | GPIO0D1_MASK |
-		     GPIO0D2_MASK | GPIO0D3_MASK,
-		     GPIO0D0_GPIO << GPIO0D0_SHIFT |
-		     GPIO0D1_GPIO << GPIO0D1_SHIFT |
-		     GPIO0D2_UART4_SOUT << GPIO0D2_SHIFT |
-		     GPIO0D3_UART4_SIN << GPIO0D3_SHIFT);
-	return 0;
-}
 
 int board_init(void)
 {