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/mvebu_crb_cn9130_defconfig b/configs/mvebu_crb_cn9130_defconfig
index e4a786c..fd0a5d9 100644
--- a/configs/mvebu_crb_cn9130_defconfig
+++ b/configs/mvebu_crb_cn9130_defconfig
@@ -22,6 +22,7 @@
 CONFIG_ARCH_EARLY_INIT_R=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SYS_PROMPT="Marvell>> "
+CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_MTD=y