orangepipc: rename to orangepi-pc

Rename orangepipc files, configs, and directories:
- oragepipc_defconfig -> orangepi_pc_defconfig
- board/orangepi/orangepipc -> board/orangepi/orangepi-pc

The purpose of the patch is to improve readability before
adding other boards of orangepi family.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/DEVELOPERS b/DEVELOPERS
index 903e9a9..d855d11 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -1151,7 +1151,7 @@
 
 N:	Peter Korsgaard <peter@korsgaard.com>
 F:	board/orangepi/
-F:	configs/orangepipc_defconfig
+F:	configs/orangepi_pc_defconfig
 F:	package/flickcurl/
 F:	package/libfastjson/
 F:	package/lzop/