csky-opc.h: Initialize fields of last array elements

csky-opc.h: Initialize fields of last array elements

clang gives these errors:

In file included from /Users/simark/src/binutils-gdb/opcodes/csky-dis.c:30:
/Users/simark/src/binutils-gdb/opcodes/csky-opc.h:2330:8: error: missing field 'transfer' initializer [-Werror,-Wmissing-field-initializers]
  {NULL}
       ^
/Users/simark/src/binutils-gdb/opcodes/csky-opc.h:8126:10: error: missing field 'transfer' initializer [-Werror,-Wmissing-field-initializers]
    {NULL}
         ^

They go away when we Initialize all fields.  I noticed there used to be some
files built with -Wno-missing-field-initializers, but it's not the case
anymore, since commit e7ae278d0474ab84ba3b1ee932a19e83616ddacc.  There is still
a NO_WMISSING_FIELD_INITIALIZERS variable defined in the Makefile, but it's
unused, so I removed it to avoid further confusion.

opcodes/ChangeLog:

	* Makefile.am: Remove NO_WMISSING_FIELD_INITIALIZERS.
	* Makefile.in: Re-generate.
	* aclocal.m4: Re-generate.
	* configure: Re-generate.
	* configure.ac: Remove check for -Wno-missing-field-initializers.
	* csky-opc.h (csky_v1_opcodes): Initialize all fields of last element.
	(csky_v2_opcodes): Likewise.