arm: sunxi: increase SYS_MALLOC_F_LEN

The current default of 0x400 for SYS_MALLOC_F_LEN is too small if any
additional drivers marked as DM_FLAG_PRE_RELOC are loaded before
relocation.

CONFIG_RSA=y which is needed for UEFI secure boot or for FIT image
verification loads the driver mod_exp_sw which has DM_FLAG_PRE_RELOC.

CONFIG_LOG=Y is another setting requiring additional early malloc
area, cf. log_init().

When running pine64-lts_defconfig with CONFIG_RSA=y and debug UART enabled
we see as output in main U-Boot

    alloc_simple() alloc space exhausted

With this patch the default values of SYS_MALLOC_F_LEN and
SPL_SYS_MALLOC_F_LEN on ARCH_SUNXI are raised to 0x2000.

Signed-off-by: Heinrich Schuchardt <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

Kconfig

@@ -200,7 +200,7 @@ config SYS_MALLOC_F_LEN
 	default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
 			   ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
 			   ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
-			   ARCH_LS1046A || ARCH_QEMU)
+			   ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI)
 	default 0x400
 	help
 	  Before relocation, memory is very limited on many platforms. Still,