msm8974: Enable UART

Add clock and gpio support needed for UART on 8974.

Change-Id: I277941c8fa4c1dad8cf241e638dde71d156c6fb4
diff --git a/project/copper.mk b/project/copper.mk
index 79681f0..35e2c15 100644
--- a/project/copper.mk
+++ b/project/copper.mk
@@ -9,7 +9,7 @@
 DEBUG := 1
 
 #DEFINES += WITH_DEBUG_DCC=1
-#DEFINES += WITH_DEBUG_UART=1
+DEFINES += WITH_DEBUG_UART=1
 #DEFINES += WITH_DEBUG_FBCON=1
 DEFINES += DEVICE_TREE=1
 #DEFINES += MMC_BOOT_BAM=1