ARM: uniphier: fix build error when CONFIG_DEBUG_LL is defined

The build error happens if CONFIG_DEBUG_LL and CONFIG_MACH_PH1_SLD3
are both enabled.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S

@@ -10,6 +10,8 @@
 #include <mach/bcu-regs.h>
 #include <mach/sc-regs.h>
 #include <mach/sg-regs.h>
+
+#define UART_CLK		36864000
 #include <mach/debug-uart.S>
 
 ENTRY(setup_lowlevel_debug)