arm: uniphier: Change _debug_uart_putc function to inline

Update the definition of _debug_uart_putc to static inline.
This matches the instructions in include/debug_uart.h and
provides consistency with implementations for other platforms.

Signed-off-by: Lukasz Czechowski <lukasz.czechowski@thaumatec.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart.c b/arch/arm/mach-uniphier/debug-uart/debug-uart.c
index 6836eb6..1a3e290 100644
--- a/arch/arm/mach-uniphier/debug-uart/debug-uart.c
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart.c
@@ -16,7 +16,7 @@
 #define UNIPHIER_UART_LSR		0x14
 #define UNIPHIER_UART_LDR		0x24
 
-static void _debug_uart_putc(int c)
+static inline void _debug_uart_putc(int c)
 {
 	void __iomem *base = (void __iomem *)CONFIG_VAL(DEBUG_UART_BASE);