sunxi: Switch to using malloc_simple for the spl

common/dlmalloc.c is quite big, both in .text and .data usage. E.g. for a
Mele_M9 sun6i board build this reduces .text from 0x4214 to 0x3b94 bytes,
and .data from 0x54c to 0x144 bytes.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1a7e916..9bc5946 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -523,6 +523,7 @@
 	select OF_CONTROL
 	select OF_SEPARATE
 	select SPL_STACK_R if !MACH_SUN9I
+	select SPL_SYS_MALLOC_SIMPLE if !MACH_SUN9I
 	select USB
 	select USB_STORAGE
 	select USB_KEYBOARD