core: read: fix dev_read_addr_size()

core: read: fix dev_read_addr_size()

The behaviour of dev_read_addr_size() is surprising as it does not
handle #address-cells and #size-cells but instead hardcodes the values
based on sizeof(fdt_addr_t).

This is different from dev_read_addr_size_index() and
dev_read_addr_size_name() both of which do read the cell sizes from the
device tree.

Since dev_read_addr_size() is only used by a single driver and this
driver is broken when CONFIG_FDT_64BIT does not match the address size
in the device tree, fix the function to behave like all of the other
similarly named functions.  Drop the property name argument as the only
caller passes "reg" and this is the expected property name matching the
other similarly named functions.

Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>  # chromebook_jerry
Tested-by: Simon Glass <sjg@chromium.org>  # chromebook_bob