Convert CONFIG_SYS_MAXARGS to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_MAXARGS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/warp7_defconfig b/configs/warp7_defconfig
index b72332c..50c4ba0 100644
--- a/configs/warp7_defconfig
+++ b/configs/warp7_defconfig
@@ -23,6 +23,7 @@
 CONFIG_BOOTCOMMAND="mmc dev ${mmcdev}; if mmc rescan; then run do_bootscript_hab;if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; fi; fi; fi"
 # CONFIG_BOARD_EARLY_INIT_F is not set
 CONFIG_HUSH_PARSER=y
+CONFIG_SYS_MAXARGS=32
 # CONFIG_CMD_BOOTD is not set
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMI is not set