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/common/spl/Kconfig b/common/spl/Kconfig
index 1c2fe78..b9d96fb 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -402,21 +402,21 @@
 	  location is used. Normally we put the device tree at the end of BSS
 	  but with this option enabled, it goes at _image_binary_end.
 
-config SYS_SPL_MALLOC
+config SPL_SYS_MALLOC
 	bool "Enable malloc pool in SPL"
 	depends on SPL_FRAMEWORK
 
-config HAS_CUSTOM_SPL_MALLOC_START
+config SPL_HAS_CUSTOM_MALLOC_START
 	bool "For the SPL malloc pool, define a custom starting address"
-	depends on SYS_SPL_MALLOC
+	depends on SPL_SYS_MALLOC
 
-config CUSTOM_SYS_SPL_MALLOC_ADDR
+config SPL_CUSTOM_SYS_MALLOC_ADDR
 	hex "SPL malloc addr"
-	depends on HAS_CUSTOM_SPL_MALLOC_START
+	depends on SPL_HAS_CUSTOM_MALLOC_START
 
-config SYS_SPL_MALLOC_SIZE
+config SPL_SYS_MALLOC_SIZE
 	hex "Size of the SPL malloc pool"
-	depends on SYS_SPL_MALLOC
+	depends on SPL_SYS_MALLOC
 	default 0x100000
 
 config SPL_READ_ONLY