Convert CONFIG_USE_BOOTCOMMAND et al to Kconfig

This converts the following to Kconfig:
   CONFIG_USE_BOOTCOMMAND
   CONFIG_BOOTCOMMAND
   CONFIG_RAMBOOTCOMMAND
   CONFIG_NFSBOOTCOMMAND

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/tqma6.h b/include/configs/tqma6.h
index 233031b..633b100 100644
--- a/include/configs/tqma6.h
+++ b/include/configs/tqma6.h
@@ -119,9 +119,6 @@
 		"fi; fi; "                                                     \
 		"setenv filesize; setenv blkc \0"                              \
 
-#define CONFIG_BOOTCOMMAND \
-	"run mmcboot; run netboot; run panicboot"
-
 #elif defined(CONFIG_TQMA6X_SPI_BOOT)
 
 #define TQMA6_UBOOT_OFFSET		0x400
@@ -205,11 +202,7 @@
 		"setexpr offset ${fdt_start} * "                               \
 			__stringify(TQMA6_SPI_FLASH_SECTOR_SIZE)"; "           \
 		"sf read ${fdt_addr} ${offset} ${size}; "                      \
-		"setenv size ; setenv offset\0"                                \
-
-#define CONFIG_BOOTCOMMAND                                                     \
-	"sf probe; run mmcboot; run netboot; run panicboot"                    \
-
+		"setenv size ; setenv offset\0"
 #else
 
 #error "need to define boot source"