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/powerpc/cpu/mpc83xx/spl_minimal.c b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
index 8fcf208..7cc0383 100644
--- a/arch/powerpc/cpu/mpc83xx/spl_minimal.c
+++ b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
@@ -54,12 +54,12 @@
 	im->sysconf.spcr |= SPCR_TBEN;
 
 	/* DDR control driver register */
-#ifdef CONFIG_SYS_DDRCDR
-	im->sysconf.ddrcdr = CONFIG_SYS_DDRCDR;
+#ifdef CFG_SYS_DDRCDR
+	im->sysconf.ddrcdr = CFG_SYS_DDRCDR;
 #endif
 	/* Output buffer impedance register */
-#ifdef CONFIG_SYS_OBIR
-	im->sysconf.obir = CONFIG_SYS_OBIR;
+#ifdef CFG_SYS_OBIR
+	im->sysconf.obir = CFG_SYS_OBIR;
 #endif
 
 	/*