Remove SHRAM RECONFIG PMU event from U85 interface

The SHRAM RECONFIG PMU event is not supported on Ethos-U85 and has
therefore been removed from the interface file

Change-Id: I8123cdc24764087b5f7b6dc0d44fb7c3c53242f7
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>