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/db-xc3-24g4xg_defconfig b/configs/db-xc3-24g4xg_defconfig
index 58fcf96..49c9111 100644
--- a/configs/db-xc3-24g4xg_defconfig
+++ b/configs/db-xc3-24g4xg_defconfig
@@ -17,6 +17,7 @@
 CONFIG_FIT_BEST_MATCH=y
 CONFIG_USE_PREBOOT=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_SYS_MAXARGS=96
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_ALT_MEMTEST=y
 # CONFIG_CMD_FLASH is not set