cmd: remove CONFIG_SOURCE support in Makefile

This line is no more needed and can be removed.

Only CONFIG_CMD_SOURCE is defined in Kconfig and
used in defconfig files.

CONFIG_SOURCE if not defined in source code and
"config SOURCE" is not present in any Kconfig.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

cmd/Makefile

@@ -15,7 +15,6 @@ obj-$(CONFIG_CMD_AES) += aes.o
 obj-$(CONFIG_CMD_ADC) += adc.o
 obj-$(CONFIG_CMD_ARMFLASH) += armflash.o
 obj-y += blk_common.o
-obj-$(CONFIG_SOURCE) += source.o
 obj-$(CONFIG_CMD_SOURCE) += source.o
 obj-$(CONFIG_CMD_BDI) += bdinfo.o
 obj-$(CONFIG_CMD_BEDBUG) += bedbug.o