dm: Rename dev_addr..() functions

These support the flat device tree. We want to use the dev_read_..()
prefix for functions that support both flat tree and live tree. So rename
the existing functions to avoid confusion.

In the end we will have:

   1. dev_read_addr...()    - works on devices, supports flat/live tree
   2. devfdt_get_addr...()  - current functions, flat tree only
   3. of_get_address() etc. - new functions, live tree only

All drivers will be written to use 1. That function will in turn call
either 2 or 3 depending on whether the flat or live tree is in use.

Note this involves changing some dead code - the imx_lpi2c.c file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/ath79_spi.c b/drivers/spi/ath79_spi.c
index b18c733..f4b92aa 100644
--- a/drivers/spi/ath79_spi.c
+++ b/drivers/spi/ath79_spi.c
@@ -177,7 +177,7 @@
 	struct ath79_spi_priv *priv = dev_get_priv(bus);
 	fdt_addr_t addr;
 
-	addr = dev_get_addr(bus);
+	addr = devfdt_get_addr(bus);
 	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;