build: unify verbosity handling

This change introduces a few helper variables for dealing with verbose
and silent build modes: `silent`, `verbose`, `q` and `s`.

The `silent` and `verbose` variables

build: unify verbosity handling

This change introduces a few helper variables for dealing with verbose
and silent build modes: `silent`, `verbose`, `q` and `s`.

The `silent` and `verbose` variables are boolean values determining
whether the build system has been configured to run silently or
verbosely respectively (i.e. with `--silent` or `V=1`).

These two modes cannot be used together - if `silent` is truthy then
`verbose` is always falsy. As such:

make --silent V=1

... results in a silent build.

In addition to these boolean variables, we also introduce two new
variables - `s` and `q` - for use in rule recipes to conditionally
suppress the output of commands.

When building silently, `s` expands to a value which disables the
command that follows, and `q` expands to a value which supppresses
echoing of the command:

$(s)echo 'This command is neither echoed nor executed'
$(q)echo 'This command is executed but not echoed'

When building verbosely, `s` expands to a value which disables the
command that follows, and `q` expands to nothing:

$(s)echo 'This command is neither echoed nor executed'
$(q)echo 'This command is executed and echoed'

In all other cases, both `s` and `q` expand to a value which suppresses
echoing of the command that follows:

$(s)echo 'This command is executed but not echoed'
$(q)echo 'This command is executed but not echoed'

The `s` variable is predominantly useful for `echo` commands, where you
always want to suppress echoing of the command itself, whilst `q` is
more useful for all other commands.

Change-Id: I8d8ff6ed714d3cb401946c52955887ed7dca602b
Signed-off-by: Chris Kay <chris.kay@arm.com>

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refactor(fiptool): move plat_fiptool.mk to tools

Move all plat_fiptool.mks into tools, change the logic to recursively
check for tools/fiptool/plat_fiptool/<plat_path>/plat_fiptool.mk

I.e. for a pl

refactor(fiptool): move plat_fiptool.mk to tools

Move all plat_fiptool.mks into tools, change the logic to recursively
check for tools/fiptool/plat_fiptool/<plat_path>/plat_fiptool.mk

I.e. for a platform that has the path "plat/arm/board/tc/platform.mk",
the makefile will now load the first existing file from:
- tools/fiptool/plat_fiptool/arm/board/tc/plat_fiptool.mk
- tools/fiptool/plat_fiptool/arm/board/plat_fiptool.mk
- tools/fiptool/plat_fiptool/arm/plat_fiptool.mk

This enables fiptool to support multiple platforms, or a specific one.

Remove file-copying previously being used to handle old default path.
Remove custom file cleaning in plat_fiptool.mk.

Change-Id: I95245bcf7143b329481d4394ab64f29bfe9de5ab
Signed-off-by: Raef Coles <raef.coles@arm.com>

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