tests/tcg/README: fix location for lm32 tests

Point to the right and obvious location for lm32 tests.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20181004161852.11673-3-crosa@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

tests/tcg/README

@@ -10,6 +10,6 @@ with "make test-cris".
 
 LM32
 ====
-The testsuite for LM32 is in tests/tcg/cris.  You can run it
+The testsuite for LM32 is in tests/tcg/lm32.  You can run it
 with "make test-lm32".