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/liteboard_defconfig b/configs/liteboard_defconfig
index bf700df..c78ffab 100644
--- a/configs/liteboard_defconfig
+++ b/configs/liteboard_defconfig
@@ -26,6 +26,7 @@
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SPL_WATCHDOG=y
 CONFIG_HUSH_PARSER=y
+CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_GPIO=y