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/cmd/date.c b/cmd/date.c
index 0e2dfbc..58505e6 100644
--- a/cmd/date.c
+++ b/cmd/date.c
@@ -51,10 +51,10 @@
 	}
 #elif CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
 	old_bus = i2c_get_bus_num();
-	i2c_set_bus_num(CONFIG_SYS_RTC_BUS_NUM);
+	i2c_set_bus_num(CFG_SYS_RTC_BUS_NUM);
 #else
 	old_bus = I2C_GET_BUS();
-	I2C_SET_BUS(CONFIG_SYS_RTC_BUS_NUM);
+	I2C_SET_BUS(CFG_SYS_RTC_BUS_NUM);
 #endif
 
 	switch (argc) {