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/netspace_v2_defconfig b/configs/netspace_v2_defconfig
index 00c19f5..48c0e4f 100644
--- a/configs/netspace_v2_defconfig
+++ b/configs/netspace_v2_defconfig
@@ -28,6 +28,7 @@
 CONFIG_RESET_PHY_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="ns2> "
+CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_EEPROM=y
 CONFIG_SYS_EEPROM_PAGE_WRITE_BITS=4
 CONFIG_CMD_I2C=y