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/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig
index 8d6424c..570252d 100644
--- a/drivers/bootcount/Kconfig
+++ b/drivers/bootcount/Kconfig
@@ -83,7 +83,7 @@
 	bool "Boot counter on I2C device"
 	help
 	  Enable support for the bootcounter on an i2c (like RTC) device.
-	  CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
+	  CFG_SYS_I2C_RTC_ADDR = i2c chip address
 	  CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
 	                              the bootcounter.