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/arm/include/asm/arch-sunxi/i2c.h b/arch/arm/include/asm/arch-sunxi/i2c.h
index 3525f22..241b449 100644
--- a/arch/arm/include/asm/arch-sunxi/i2c.h
+++ b/arch/arm/include/asm/arch-sunxi/i2c.h
@@ -18,6 +18,6 @@
 #endif
 
 /* This is abp0-clk on sun4i/5i/7i / abp1-clk on sun6i/sun8i which is 24MHz */
-#define CONFIG_SYS_TCLK		24000000
+#define CFG_SYS_TCLK		24000000
 
 #endif