CMD: Drop CONFIG_CMD_DFL, it's not used

$ git grep CMD_DFL
board/atc/ti113x.c:#define CMD_DFLT (PCI_COMMAND_IO|PCI_COMMAND_MEMORY| \
board/atc/ti113x.c:     pci_writew (s, PCI_COMMAND, CMD_DFLT);
board/cpc45/pd67290.c:#define CMD_DFLT (PCI_COMMAND_IO|PCI_COMMAND_MEMORY| \
board/cpc45/pd67290.c:  pci_writew (s, PCI_COMMAND, CMD_DFLT);
drivers/pcmcia/i82365.c:#define CMD_DFLT (PCI_COMMAND_IO|PCI_COMMAND_MEMORY| \
drivers/pcmcia/i82365.c:        pci_writew (s, PCI_COMMAND, CMD_DFLT);
include/configs/MBX.h:#define CONFIG_CMD_DFL
include/configs/MigoR.h:#define CONFIG_CMD_DFL
include/configs/digsy_mtc.h:#define CONFIG_CMD_DFL
include/configs/ms7722se.h:#define CONFIG_CMD_DFL
include/configs/ms7750se.h:#define CONFIG_CMD_DFL
include/configs/r2dplus.h:#define CONFIG_CMD_DFL
include/configs/sh7757lcr.h:#define CONFIG_CMD_DFL
include/configs/sh7785lcr.h:#define CONFIG_CMD_DFL

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Pfister_Werner@intercontrol.de
Cc: iwamatsu@nigauri.org
Cc: nobuhiro.iwamatsu.yj@renesas.com
Cc: vapier@gentoo.org
Cc: wd@denx.de
Cc: yoshihiro.shimoda.uh@renesas.com
Acked-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>