Remove vpath usage in makefiles

Remove all usage of the vpath keyword in makefiles as it was prone
to mistakes. Specify the relative paths to source files instead.

Also reorder source files in makefiles alphabetically.

Fixes ARM-software/tf-issues#121

Change-Id: Id15f60655444bae60e0e2165259efac71a50928b
diff --git a/Makefile b/Makefile
index 23ab010..3064aa4 100644
--- a/Makefile
+++ b/Makefile
@@ -59,14 +59,14 @@
 	BUILD_TYPE	:=	release
 endif
 
-BL_COMMON_SOURCES	:=	misc_helpers.S		\
-				cache_helpers.S		\
-				tlb_helpers.S		\
-				xlat_helpers.c		\
-				std.c			\
-				bl_common.c		\
-				platform_helpers.S	\
-				io_storage.c
+BL_COMMON_SOURCES	:=	common/bl_common.c			\
+				lib/aarch64/cache_helpers.S		\
+				lib/aarch64/misc_helpers.S		\
+				lib/aarch64/tlb_helpers.S		\
+				lib/aarch64/xlat_helpers.c		\
+				lib/stdlib/std.c			\
+				lib/io_storage.c			\
+				plat/common/aarch64/platform_helpers.S
 
 ARCH 			?=	aarch64
 
@@ -161,13 +161,6 @@
 LDFLAGS			+=	--gc-sections
 
 
-vpath %.ld.S bl1:bl2:bl31
-vpath %.c bl1:bl2:bl31
-vpath %.c bl1/${ARCH}:bl2/${ARCH}:bl31/${ARCH}
-vpath %.S bl1/${ARCH}:bl2/${ARCH}:bl31/${ARCH}
-vpath %.c lib/arch/${ARCH} # One of the missing paths needed for BL_COMMON_SOURCES
-
-
 ifneq (${DEBUG}, 0)
 #CFLAGS			+= 	-g -O0
 CFLAGS			+= 	-g