refactor(rpi): split out console registration logic

Detection of the UART in use and GPIO code only apply to RPi 3 and 4.

RPi 5 has a dedicated PL011 debug port.

Change-Id: Iddf8aea01278e2b79b4e7c476740f1add8c419f0
Signed-off-by: Mario Bălănică <mariobalanica02@gmail.com>
diff --git a/plat/rpi/rpi3/platform.mk b/plat/rpi/rpi3/platform.mk
index 26a3268..8034fa4 100644
--- a/plat/rpi/rpi3/platform.mk
+++ b/plat/rpi/rpi3/platform.mk
@@ -17,6 +17,7 @@
 				drivers/rpi3/gpio/rpi3_gpio.c		\
 				plat/rpi/common/aarch64/plat_helpers.S	\
 				plat/rpi/common/rpi3_common.c		\
+				plat/rpi/common/rpi3_console_dual.c	\
 				${XLAT_TABLES_LIB_SRCS}
 
 BL1_SOURCES		+=	drivers/io/io_fip.c			\