Move IO storage source to drivers directory

Move the remaining IO storage source file (io_storage.c) from the
lib to the drivers directory. This requires that platform ports
explicitly add this file to the list of source files.

Also move the IO header files to a new sub-directory, include/io.

Change-Id: I862b1252a796b3bcac0d93e50b11e7fb2ded93d6

Makefile

@@ -102,7 +102,6 @@ BL_COMMON_SOURCES	:=	common/bl_common.c			\
 				lib/aarch64/misc_helpers.S		\
 				lib/aarch64/xlat_helpers.c		\
 				lib/stdlib/std.c			\
-				lib/io_storage.c			\
 				plat/common/aarch64/platform_helpers.S
 
 BUILD_BASE		:=	./build
@@ -180,6 +179,7 @@ INCLUDES		+=	-Iinclude/bl31			\
 				-Iinclude/common		\
 				-Iinclude/drivers		\
 				-Iinclude/drivers/arm		\
+				-Iinclude/drivers/io		\
 				-Iinclude/lib			\
 				-Iinclude/lib/aarch64		\
 				-Iinclude/plat/common		\

plat/fvp/platform.mk

@@ -66,6 +66,7 @@ PLAT_BL_COMMON_SOURCES	:=	drivers/arm/pl011/pl011_console.S		\
 				drivers/io/io_fip.c				\
 				drivers/io/io_memmap.c				\
 				drivers/io/io_semihosting.c			\
+				drivers/io/io_storage.c				\
 				lib/aarch64/xlat_tables.c			\
 				lib/semihosting/semihosting.c			\
 				lib/semihosting/aarch64/semihosting_call.S	\