zynq: Increase the early malloc() size

This is needed to support driver-model conversion of USB and block devices.
Signed-off-by: NSimon Glass <sjg@chromium.org>

arch/arm/cpu/armv8/zynqmp/Kconfig

@@ -20,4 +20,8 @@ config SYS_CONFIG_NAME
 config ZYNQMP_USB
 	bool "Configure ZynqMP USB"
 
+config SYS_MALLOC_F_LEN
+	default 0x600
+
+
 endif

arch/arm/mach-zynq/Kconfig

@@ -17,4 +17,7 @@ config SYS_CONFIG_NAME
 	  Based on this option include/configs/<CONFIG_SYS_CONFIG_NAME>.h header
 	  will be used for board configuration.
 
+config SYS_MALLOC_F_LEN
+	default 0x600
+
 endif