Add support of coprocessor cp15, cp14 registers exposion in the embedded gdb server

Please add support of exposion of ARM coprocesor registers/logic at the embedded gdb server,
 for example of cp15, cp14, etc registers.

Related project http://jtagarmgdbsrvr.sourceforge.net/index.html

Also filled bug in the GDB http://sourceware.org/bugzilla/show_bug.cgi?id=12602