[testsuite] fixes for gcc.target/arm/mla-1.c

[Janis Johnson]

Test gcc.target/arm/mla-1.c scans the assembly file for a string that is
part of the name, which always succeeds.  This patch adds a tab to the
search target to avoid that.  It also removes the -march option and
pruning of warnings about conflicts, and restricts the tests to targets
that support Thumb-2, with support for new effective target arm_thumb2.
Changes to the comment for arm_thumb1 support clarify the difference
between it and arm_thumb1_ok.

OK for trunk, and for 4.6 in a few days if no problems?
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