kconfig: Clean up header comments and make them consistent

Use this short header style in all Kconfig files:

    # <description>

    # <copyright>
    # <license>

    ...

Also change all <description>s from

    # Kconfig[.extension] - Foo-related options

to just

    # Foo-related options

It's clear enough that it's about Kconfig.

The <description> cleanup was done with this command, along with some
manual cleanup (big letter at the start, etc.)

    git ls-files '*Kconfig*' | \
        xargs sed -i -E '1 s/#\s*Kconfig[\w.-]*\s*-\s*/# /'

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

ext/Kconfig

@@ -1,10 +1,7 @@
-# Kconfig - external source code configuration options
+# External source code configuration options
 
-#
 # Copyright (c) 2016 Linaro Ltd.
-#
 # SPDX-License-Identifier: Apache-2.0
-#
 
 menu "External Sources"
 

ext/hal/Kconfig

@@ -1,10 +1,7 @@
-# Kconfig - external HAL source code configuration options
+# External HAL source code configuration options
 
-#
 # Copyright (c) 2016-2017 Linaro Ltd.
-#
 # SPDX-License-Identifier: Apache-2.0
-#
 
 # When adding new entries keep the list in alphabetical order
 

ext/hal/altera/Kconfig

@@ -1,8 +1,6 @@
-# Kconfig - Altera HAL drivers configuration
+# Altera HAL drivers configuration
 
-#
 # Copyright (c) 2017 Intel Corporation
-#
 # SPDX-License-Identifier: Apache-2.0
 
 config HAS_ALTERA_HAL

ext/lib/crypto/Kconfig

@@ -1,8 +1,5 @@
-#
 # Copyright (c) 2016 Intel Corporation
-#
 # SPDX-License-Identifier: Apache-2.0
-#
 
 menu "Cryptography"
 

ext/lib/crypto/tinycrypt/Kconfig

@@ -1,10 +1,7 @@
-# Kconfig - Cryptography primitive options for TinyCrypt version 2.0
+# Cryptography primitive options for TinyCrypt version 2.0
 
-#
 # Copyright (c) 2015 Intel Corporation
-#
 # SPDX-License-Identifier: Apache-2.0
-#
 
 config TINYCRYPT
 	bool "TinyCrypt Support"

ext/lib/fnmatch/Kconfig

@@ -1,8 +1,5 @@
-#
 # Copyright (c) 2018 Nordic Semiconductor
-#
 # SPDX-License-Identifier: Apache-2.0
-#
 
 config FNMATCH
 	bool "Fnmatch Support"