common: spl: Add interactive DDR debugger support for SPL image

To support interactive DDR debugger, cli_simple.o, cli.o, cli_readline.o,
command.o, s_record.o, xyzModem.o and cmd_disk.o are all needed for
drivers/ddr/fsl/interactive.c.

In current common/Makefile, the above .o files are only produced when
CONFIG_SPL_BUILD is disabled.

For LS102xA, interactive DDR debugger is needed in SD/NAND boot too, and
I enabled CONFIG_FSL_DDR_INTERACTIVE. But according to the current
common/Makfile, all the above .o files are not produced in SPL part
because CONFIG_SPL_BUILD is enabled in SPL part, the following error
will be shown,

drivers/ddr/fsl/built-in.o: In function `fsl_ddr_interactive':
/home/wangh/layerscape/u-boot/drivers/ddr/fsl/interactive.c:1871:
undefined reference to `cli_readline_into_buffer'
/home/wangh/layerscape/u-boot/drivers/ddr/fsl/interactive.c:1873:
undefined reference to `cli_simple_parse_line'
make[1]: *** [spl/u-boot-spl] Error 1
make: *** [spl/u-boot-spl] Error 2

So this patch fixed this issue and the above .o files will be produced
no matter CONFIG_SPL_BUILD is enabled or disabled.

Signed-off-by: Alison Wang <alison.wang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

common/Makefile

@@ -8,22 +8,12 @@
 # core
 ifndef CONFIG_SPL_BUILD
 obj-y += main.o
-obj-y += command.o
 obj-y += exports.o
 obj-y += hash.o
 ifdef CONFIG_SYS_HUSH_PARSER
 obj-y += cli_hush.o
 endif
 
-# We always have this since drivers/ddr/fs/interactive.c needs it
-obj-y += cli_simple.o
-
-obj-y += cli.o
-obj-y += cli_readline.o
-obj-y += s_record.o
-obj-y += xyzModem.o
-obj-y += cmd_disk.o
-
 # This option is not just y/n - it can have a numeric value
 ifdef CONFIG_BOOTDELAY
 obj-y += autoboot.o
@@ -272,4 +262,14 @@ endif
 
 obj-$(CONFIG_CMD_BLOB) += cmd_blob.o
 
+# We always have this since drivers/ddr/fs/interactive.c needs it
+obj-y += cli_simple.o
+
+obj-y += cli.o
+obj-y += cli_readline.o
+obj-y += command.o
+obj-y += s_record.o
+obj-y += xyzModem.o
+obj-y += cmd_disk.o
+
 CFLAGS_env_embedded.o := -Wa,--no-warn -DENV_CRC=$(shell tools/envcrc 2>/dev/null)