Convert CONFIG_SYS_MALLOC_LEN to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_MALLOC_LEN

Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/configs/ls1043ardb_tfa_SECURE_BOOT_defconfig b/configs/ls1043ardb_tfa_SECURE_BOOT_defconfig
index 4cfa9fb..b48d5f4 100644
--- a/configs/ls1043ardb_tfa_SECURE_BOOT_defconfig
+++ b/configs/ls1043ardb_tfa_SECURE_BOOT_defconfig
@@ -9,6 +9,7 @@
 CONFIG_SYS_I2C_MXC_I2C2=y
 CONFIG_SYS_I2C_MXC_I2C3=y
 CONFIG_SYS_I2C_MXC_I2C4=y
+CONFIG_SYS_MALLOC_LEN=0x102000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="fsl-ls1043a-rdb"
 CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT=y