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/ls2080ardb_defconfig b/configs/ls2080ardb_defconfig
index 1001618..72a2b3b 100644
--- a/configs/ls2080ardb_defconfig
+++ b/configs/ls2080ardb_defconfig
@@ -31,6 +31,7 @@
 CONFIG_BOOTCOMMAND="env exists mcinitcmd && env exists secureboot && esbc_validate 0x5806C0000; env exists mcinitcmd && fsl_mc lazyapply dpl 0x580d00000;run distro_bootcmd;run nor_bootcmd; env exists secureboot && esbc_halt;"
 CONFIG_MISC_INIT_R=y
 CONFIG_RESET_PHY_R=y
+CONFIG_SYS_MAXARGS=64
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_EEPROM=y