configs: rename a bunch of friendlyarm boards

We have defconfigs for quite a few friendlyarm boards, but the
naming for the defconfigs for those boards is inconsistent: some
start with 'friendlyarm_' while others don't.

Although the number of boards starting with 'friendlyarm_' is
less than those which do not, we still choose to rename the
boards so all have the 'friendlyarm_' prefix.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Chakra Divi <chakra@openedev.com>
Cc: Davide Viti <zinosat@gmail.com>
Cc: Marek Belisko <marek.belisko@open-nandra.com>
Cc: Suniel Mahesh <sunil@amarulasolutions.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

board/friendlyarm/nanopc-t4/readme.txt

@@ -3,7 +3,7 @@ FriendlyARM NANOPC-T4
 
 Build:
 
-  $ make nanopc_t4_defconfig
+  $ make friendlyarm_nanopc_t4_defconfig
   $ make
 
 Files created in output directory

board/friendlyarm/nanopi-m1-plus/readme.txt

@@ -12,7 +12,7 @@ How to build it
 
 Configure Buildroot:
 
-    $ make nanopi_m1_plus_defconfig
+    $ make friendlyarm_nanopi_m1_plus_defconfig
 
 Compile everything and build the SD card image:
 

board/friendlyarm/nanopi-m1/readme.txt

@@ -12,7 +12,7 @@ How to build it
 
 Configure Buildroot:
 
-    $ make nanopi_m1_defconfig
+    $ make friendlyarm_nanopi_m1_defconfig
 
 Compile everything and build the SD card image:
 

board/friendlyarm/nanopi-m4/readme.txt

@@ -3,7 +3,7 @@ FriendlyARM NANOPI-M4
 
 Build:
 
-  $ make nanopi_m4_defconfig
+  $ make friendlyarm_nanopi_m4_defconfig
   $ make
 
 Files created in output directory

board/friendlyarm/nanopi-neo/readme.txt

@@ -24,7 +24,7 @@ yet upstream, but are being actively worked on.
 How to build
 ============
 
-    $ make nanopi_neo_defconfig
+    $ make friendlyarm_nanopi_neo_defconfig
     $ make
 
 Note: you will need access to the internet to download the required

board/friendlyarm/nanopi-neo4/readme.txt

@@ -12,7 +12,7 @@ Build
 
 Run NanoPi Neo4 configuration
 
-  $ make nanopi_neo4_defconfig
+  $ make friendlyarm_nanopi_neo4_defconfig
 
 To build, run make comamnd.
 

board/friendlyarm/nanopi-r1/readme.txt

@@ -12,7 +12,7 @@ How to build it
 
 Configure Buildroot:
 
-    $ make nanopi_r1_defconfig
+    $ make friendlyarm_nanopi_r1_defconfig
 
 Compile everything and build the SD card image: