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Rule 5.7: A tag name shall be a unique identifier

There were 2 amu_ctx struct type definitions:
    - In lib/extensions/amu/aarch64/amu.c
    - In lib/cpus/aarch64/cpuamu.c

Renamed the latter to cpuamu_ctx to avoid this name clash

To avoid violation of Rule 8.3 also change name of function
amu_ctxs to unique name (cpuamu_ctxs) since it now returns a
different type (cpuamu_ctx) than the other amu_ctxs function

Fixed for:
    make LOG_LEVEL=50 PLAT=fvp

Change-Id: Ieeb7e390ec2900fd8b775bef312eda93804a43ed
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

Change-Id: I61c9fdfda0c0b3c3ec6249519db23602cf4c2100
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>

This patch also fixes the assumption that the counters are disabled on
the resume path.  This is incorrect as the AMU counters are enabled
early in the CPU reset function before `cpuamu_context_restore()`
runs.

Change-Id: I38a94eb166a523f00de18e86860434ffccff2131
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>