Clean up fesvr/dtm_t

* This enables useful functionality in inheritors

* fesvr/debug_defines.h is removed

explicitly show D(-mode) instead of M(-mode) when in debug mode

Debug mode (D-mode) can be considered an additional privilege mode.
This commit proposes printing D(-mode) instead of M(-mode) for D-mode.

Print cache stats even when no access

Allow client to override default names of caches

Add cache statistics print on demand

Improve icount trigger implementation

Spec says:

> This trigger matches on every instruction completed or trap
> taken from a privilege mode where the trigger is enabled.

Other (synchronous) traps were already correctly decrementing count,
but external interrupts (i.e. timer interrupts) were not.

According to table in debug spec.

This has no visible effect, because every time we instantiate an
icount_t (in triggers::module_t::tdata1_write) we immediately call
tdata1_write() which sets these values, but it's cleaner this way.

Add Zfa support

In multi-processor systems it is desired to track
caches separately by assigning unique names to them.

Signed-off-by: Jakub Palider <jpalider@marvell.com>

The cache stats are printed regardless on accesses they
recorded. This allows better insight into system operation
and provides consistent output for scripting.

Signed-off-by: Jakub Palider <jpalider@marvell.com>

With this change it is not necessary to wait for
tracer destructor to trigger statistics printout.

Signed-off-by: Jakub Palider <jpalider@marvell.com>

This passes our developer test suite, when comparing output
(signature) against the SAIL implementation.

If any corner-cases require additional changes after ACT goes
upstream, we can apply an add-on patch.

Fix --bootargs default value in spike usage help() function

Commit 191634d2

 changed the default kernel boot args from
"console=hvc0 earlycon=sbi" to "console=ttyS0 earlycon", but didn't
updated the spike usage help() function.

This commit introduces a new macro DEFAULT_KERNEL_BOOTARGS in order to
have a single definition. This macro is used everywhere in dts.cc and
spike.cc help() function.

Signed-off-by: Julien Olivain <ju.o@free.fr>

Stop unconditionally adding zicntr/zihpm to supported extensions

Ran autoreconf in top directory, version 2.69

Add processor_t::is_waiting_for_interrupt accessor

Signed-off-by: Jerry Zhao <jerryz123@berkeley.edu>