global: Move remaining CONFIG_SYS_* to CFG_SYS_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do
not easily transition to Kconfig. In many cases they likely should come
from the device tree instead. Move these out of CONFIG namespace and in
to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/mips/mach-mtmips/mt7621/spl/start.S b/arch/mips/mach-mtmips/mt7621/spl/start.S
index 6b9f253..7063f32 100644
--- a/arch/mips/mach-mtmips/mt7621/spl/start.S
+++ b/arch/mips/mach-mtmips/mt7621/spl/start.S
@@ -19,7 +19,7 @@
 
 #ifndef CONFIG_SYS_INIT_SP_ADDR
 #define CONFIG_SYS_INIT_SP_ADDR	(CFG_SYS_SDRAM_BASE + \
-				CONFIG_SYS_INIT_SP_OFFSET)
+				CFG_SYS_INIT_SP_OFFSET)
 #endif
 
 #define SP_ADDR_TEMP		0xbe10dff0