pl011: allow alternate stdout to be used

Till now only pl011 UART is available stdout but there is a usecase to
redirect it to other channel.

This patch decouples console_putc implementation from pl011.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I38e8c5c90421fad2425228f407e6f29bdf6b08c7
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 73b4690..b146654 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -8,6 +8,7 @@
 
 PLAT_SOURCES	+=	drivers/arm/gic/gic_common.c			\
 			drivers/arm/pl011/${ARCH}/pl011_console.S	\
+			drivers/console/console.c			\
 			plat/arm/common/arm_setup.c			\
 			plat/arm/common/arm_timers.c