arm: pdu001: Fix early debugging UART

The changes from commit 0dba458 ("arm: Init the debug UART")
prevent the early debug UART from being initialized correctly.
To fix this we not just configure the pin multiplexer but add setting up
early clocks.

Signed-off-by: Felix Brack <fb@ltec.ch>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/eets/pdu001/Makefile

@@ -6,8 +6,4 @@
 # SPDX-License-Identifier: GPL-2.0+
 #
 
-ifeq ($(CONFIG_$(SPL_)SKIP_LOWLEVEL_INIT),)
-obj-y	:= mux.o
-endif
-
-obj-y	+= board.o
+obj-y	:= board.o mux.o

board/eets/pdu001/board.c

@@ -240,6 +240,8 @@ void sdram_init(void)
 #ifdef CONFIG_DEBUG_UART
 void board_debug_uart_init(void)
 {
+	setup_early_clocks();
+
 	/* done by pin controller driver if not debugging */
 	enable_uart_pin_mux(CONFIG_DEBUG_UART_BASE);
 }