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>
diff --git a/plat/hisilicon/hikey960/platform.mk b/plat/hisilicon/hikey960/platform.mk
index fd11a4d..c2c3122 100644
--- a/plat/hisilicon/hikey960/platform.mk
+++ b/plat/hisilicon/hikey960/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2017-2023, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2017-2024, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -146,12 +146,12 @@
 
 certificates: $(ROT_KEY)
 $(ROT_KEY): | $(BUILD_PLAT)
-	@echo "  OPENSSL $@"
-	$(Q)${OPENSSL_BIN_PATH}/openssl genrsa 2048 > $@ 2>/dev/null
+	$(s)echo "  OPENSSL $@"
+	$(q)${OPENSSL_BIN_PATH}/openssl genrsa 2048 > $@ 2>/dev/null
 
 $(ROTPK_HASH): $(ROT_KEY)
-	@echo "  OPENSSL $@"
-	$(Q)${OPENSSL_BIN_PATH}/openssl rsa -in $< -pubout -outform DER 2>/dev/null |\
+	$(s)echo "  OPENSSL $@"
+	$(q)${OPENSSL_BIN_PATH}/openssl rsa -in $< -pubout -outform DER 2>/dev/null |\
 	${OPENSSL_BIN_PATH}/openssl dgst -sha256 -binary > $@ 2>/dev/null
 endif