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/tec_defconfig b/configs/tec_defconfig
index ec6ecbc..47cba3c 100644
--- a/configs/tec_defconfig
+++ b/configs/tec_defconfig
@@ -14,6 +14,7 @@
 CONFIG_OF_SYSTEM_SETUP=y
 CONFIG_SYS_STDIO_DEREGISTER=y
 CONFIG_SYS_PROMPT="Tegra20 (TEC) # "
+CONFIG_SYS_MAXARGS=64
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y