MIPS/LD/testsuite: Fix a `tls-multi-got-1-1.s' build failure

Correct a commit ec9ab52c ("gas: consistently emit diagnostics for
non-zero data emission to .bss/.struct"),
<https://sourceware.org/ml/binutils/2015-12/msg00073.html> regression:

.../ld/testsuite/ld-mips-elf/tls-multi-got-1-1.s: Assembler messages:
.../ld/testsuite/ld-mips-elf/tls-multi-got-1-1.s:39: Error: attempt to store non-zero value in section `.tbss'
ERROR: -EB -march=mips1 -32 -KPIC .../ld/testsuite/ld-mips-elf/tls-multi-got-1-1.s: assembly failed
UNRESOLVED: Shared library with multiple GOTs and TLS

in MIPS target testing and move `tlsvar_ld' to `.tdata' section, in line
with the remaining local dynamic definitions introduced with the set of
tests added with commit f4e584bd ("TLS support for MIPS"),
<https://sourceware.org/ml/binutils/2005-02/msg00607.html>.

	ld/
	* testsuite/ld-mips-elf/tls-multi-got-1-1.s: Place `tlsvar_ld'
	in `.tdata' section.
	* testsuite/ld-mips-elf/tls-multi-got-1.got: Adjust accordingly.
	* testsuite/ld-mips-elf/tls-multi-got-1.r: Likewise.