tty: amba-pl011: remove ST micro registers from standard table

Remove the ST micro registers from the standard table.  These registers
should never be accessed in non-ST micro variants.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>