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/ls1043ardb_tfa_defconfig b/configs/ls1043ardb_tfa_defconfig
index 90623a7..b5a3e55 100644
--- a/configs/ls1043ardb_tfa_defconfig
+++ b/configs/ls1043ardb_tfa_defconfig
@@ -27,6 +27,7 @@
 CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0500 mtdparts=60000000.nor:2m@0x100000(nor_bank0_uboot),40m@0x1100000(nor_bank0_fit),7m(nor_bank0_user),2m@0x4100000(nor_bank4_uboot),40m@0x5100000(nor_bank4_fit),-(nor_bank4_user);7e800000.flash:1m(nand_uboot),1m(nand_uboot_env),20m(nand_fit);spi0.0:1m(uboot),5m(kernel),1m(dtb),9m(file_system)"
 CONFIG_ARCH_MISC_INIT=y
 CONFIG_MISC_INIT_R=y
+CONFIG_SYS_MAXARGS=64
 CONFIG_CMD_IMLS=y
 CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS=5
 CONFIG_CMD_DM=y