serial: bfin: Adjust serial_register_bfin_uart()

Rename the serial_register_bfin_uart() to bfin_initialize_serial()
to be consistent with the rest of the naming. Next, remove it's
prototype from serial.h and properly insert it into serial.c as
the rest of the serial initialization functions.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
Cc: Mike Frysinger <vapier@gentoo.org>
diff --git a/common/serial.c b/common/serial.c
index 84f05df..545f9e7 100644
--- a/common/serial.c
+++ b/common/serial.c
@@ -46,6 +46,7 @@
 serial_initfunc(s3c24xx_serial_initialize);
 serial_initfunc(s5p_serial_initialize);
 serial_initfunc(zynq_serial_initalize);
+serial_initfunc(bfin_serial_initialize);
 serial_initfunc(mpc512x_serial_initialize);
 serial_initfunc(uartlite_serial_initialize);
 
@@ -72,9 +73,7 @@
 	s3c24xx_serial_initialize();
 	s5p_serial_initialize();
 	mpc512x_serial_initialize();
-#if defined(CONFIG_SYS_BFIN_UART)
-	serial_register_bfin_uart();
-#endif
+	bfin_serial_initialize();
 	uartlite_serial_initialize();
 	zynq_serial_initalize();
 	serial_assign(default_serial_console()->name);