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/rut_defconfig b/configs/rut_defconfig
index b4a78f5..ccf2566 100644
--- a/configs/rut_defconfig
+++ b/configs/rut_defconfig
@@ -37,9 +37,9 @@
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_ARCH_MISC_INIT=y
 CONFIG_SPL_BSS_START_ADDR=0x80000000
-CONFIG_SYS_SPL_MALLOC=y
-CONFIG_HAS_CUSTOM_SPL_MALLOC_START=y
-CONFIG_CUSTOM_SYS_SPL_MALLOC_ADDR=0x80208000
+CONFIG_SPL_SYS_MALLOC=y
+CONFIG_SPL_HAS_CUSTOM_MALLOC_START=y
+CONFIG_SPL_CUSTOM_SYS_MALLOC_ADDR=0x80208000
 CONFIG_SPL_I2C=y
 CONFIG_SPL_NAND_DRIVERS=y
 CONFIG_SPL_NAND_ECC=y