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/netgear_dgnd3700v2_ram_defconfig b/configs/netgear_dgnd3700v2_ram_defconfig
index d04e73f..84d954d 100644
--- a/configs/netgear_dgnd3700v2_ram_defconfig
+++ b/configs/netgear_dgnd3700v2_ram_defconfig
@@ -20,6 +20,7 @@
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="DGND3700v2 # "
+CONFIG_SYS_MAXARGS=24
 CONFIG_CMD_CPU=y
 CONFIG_CMD_LICENSE=y
 # CONFIG_CMD_BOOTD is not set