spl: Use CONFIG_SPL... instead of CONFIG_..._SPL_...

We like to put the SPL first so it is clear that it relates to SPL. Rename
various malloc-related options which have crept in, to stick to this
convention.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Martyn Welch <martyn.welch@collabora.com>
Reviewed-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/configs/axm_defconfig b/configs/axm_defconfig
index d7d14cf..f9c0214 100644
--- a/configs/axm_defconfig
+++ b/configs/axm_defconfig
@@ -44,10 +44,10 @@
 # CONFIG_SPL_LEGACY_IMAGE_FORMAT is not set
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 # CONFIG_SPL_SHARES_INIT_SP_ADDR is not set
-CONFIG_SYS_SPL_MALLOC=y
-CONFIG_HAS_CUSTOM_SPL_MALLOC_START=y
-CONFIG_CUSTOM_SYS_SPL_MALLOC_ADDR=0x20ba0000
-CONFIG_SYS_SPL_MALLOC_SIZE=0x460000
+CONFIG_SPL_SYS_MALLOC=y
+CONFIG_SPL_HAS_CUSTOM_MALLOC_START=y
+CONFIG_SPL_CUSTOM_SYS_MALLOC_ADDR=0x20ba0000
+CONFIG_SPL_SYS_MALLOC_SIZE=0x460000
 CONFIG_SPL_NAND_SUPPORT=y
 CONFIG_SPL_NAND_RAW_ONLY=y
 CONFIG_SPL_NAND_DRIVERS=y