spl: Enable CONFIG_SPL_SYS_MALLOC_F where needed

Enable CONFIG_SPL_SYS_MALLOC_F for boards which have a non-zero value
for CONFIG_SPL_SYS_MALLOC_F_LEN

Note that the default is yes in most cases, so no changes are needed to
board defconfig options.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig
index 914f4d9..0e07304 100644
--- a/arch/arm/mach-snapdragon/Kconfig
+++ b/arch/arm/mach-snapdragon/Kconfig
@@ -6,6 +6,9 @@
 config SYS_MALLOC_F_LEN
 	default 0x2000
 
+config SPL_SYS_MALLOC_F
+	default y
+
 config SPL_SYS_MALLOC_F_LEN
 	default 0x2000
 
diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index 503c82d..114d243 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -30,6 +30,9 @@
 config SPL_STACK_R_ADDR
 	default 0x00800000 if TARGET_SOCFPGA_GEN5
 
+config SPL_SYS_MALLOC_F
+	default y if TARGET_SOCFPGA_GEN5
+
 config SPL_SYS_MALLOC_F_LEN
 	default 0x800 if TARGET_SOCFPGA_GEN5