AMU: Implement support for aarch32
Dimitris Papastamos authored
The `ENABLE_AMU` build option can be used to enable the
architecturally defined AMU counters.  At present, there is no support
for the auxiliary counter group.

Change-Id: Ifc7532ef836f83e629f2a146739ab61e75c4abc8
Signed-off-by: default avatarDimitris Papastamos <dimitris.papastamos@arm.com>
ef69e1ea