serial: Replace CONFIG_DEBUG_UART_BASE by CONFIG_VAL(DEBUG_UART_BASE)

CONFIG_VAL(DEBUG_UART_BASE) expands to CONFIG_DEBUG_UART_BASE or
CONFIG_SPL_DEBUG_UART_BASE or CONFIG_TPL_DEBUG_UART_BASE and allows boards
to set different values for SPL, TPL and U-Boot Proper.

For ns16550 driver this support is there since commit d293759d55cc
("serial: ns16550: Add support for SPL_DEBUG_UART_BASE").

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/drivers/serial/serial_pic32.c b/drivers/serial/serial_pic32.c
index ccdda9f..3c5d37c 100644
--- a/drivers/serial/serial_pic32.c
+++ b/drivers/serial/serial_pic32.c
@@ -187,14 +187,14 @@
 
 static inline void _debug_uart_init(void)
 {
-	void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
+	void __iomem *base = (void __iomem *)CONFIG_VAL(DEBUG_UART_BASE);
 
 	pic32_serial_init(base, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
 }
 
 static inline void _debug_uart_putc(int ch)
 {
-	writel(ch, CONFIG_DEBUG_UART_BASE + U_TXR);
+	writel(ch, CONFIG_VAL(DEBUG_UART_BASE) + U_TXR);
 }
 
 DEBUG_UART_FUNCS