Revert "dm: ns16550: Add support for reg-offset property"

This reverts commit d9a3bec682.

While this is a correct change to do long term it unfortunately breaks a
number of platforms that are using pdata and not named struct members so
they are getting all of their data after 'base' incorrect.

Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

include/ns16550.h

@@ -54,7 +54,6 @@
  */
 struct ns16550_platdata {
 	unsigned long base;
-	int reg_offset;
 	int reg_shift;
 	int clock;
 };