patman: Correct unit test failure

A recent rename of the function did not rename the test file. Fix this.

Fixes: 12308b128fa (lib: fdtdec: Rename routine fdtdec_setup_memory_size())
Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/tools/patman/test/0002-fdt-Correct-cast-for-sandbox-in-fdtdec_setup_memory_.patch b/tools/patman/test/0002-fdt-Correct-cast-for-sandbox-in-fdtdec_setup_mem_siz.patch
similarity index 100%
rename from tools/patman/test/0002-fdt-Correct-cast-for-sandbox-in-fdtdec_setup_memory_.patch
rename to tools/patman/test/0002-fdt-Correct-cast-for-sandbox-in-fdtdec_setup_mem_siz.patch