MIPS/LD/testsuite: Correct LD emulations for `mips*-*-kfreebsd*-gnu'

MIPS/LD/testsuite: Correct LD emulations for `mips*-*-kfreebsd*-gnu'

Complement commit 86b24e15c45b ("MIPS/LD/testsuite: Correct
comm-data.exp test ABI/emul/endian arrangement") and set LD emulations
correctly for `mips*-*-kfreebsd*-gnu' targets in comm-data.exp, removing
test suite failures:

FAIL: MIPS o32/copyreloc common symbol override test (auxiliary shared object build)
FAIL: MIPS o32/copyreloc common symbol override test
FAIL: MIPS o32/nocopyreloc common symbol override test (auxiliary shared object build)
FAIL: MIPS o32/nocopyreloc common symbol override test

	ld/
	* testsuite/ld-mips-elf/comm-data.exp: Correct support for
	`mips*-*-kfreebsd*-gnu' targets.