vbe: Rename vbe_fixup to vbe_request

The vbe_fixup file handles device tree fixups, but these are called OS
requests in VBE. Rename the file to reflect its wider purpose.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_event_dump.py b/test/py/tests/test_event_dump.py
index 674df2e..0984efa 100644
--- a/test/py/tests/test_event_dump.py
+++ b/test/py/tests/test_event_dump.py
@@ -16,7 +16,7 @@
     out = util.run_and_log(cons, ['scripts/event_dump.py', sandbox])
     expect = '''.*Event type            Id                              Source location
 --------------------  ------------------------------  ------------------------------
-EVT_FT_FIXUP          bootmeth_vbe_ft_fixup           .*vbe_fixup.c:.*
+EVT_FT_FIXUP          bootmeth_vbe_ft_fixup           .*vbe_request.c:.*
 EVT_FT_FIXUP          bootmeth_vbe_simple_ft_fixup    .*vbe_simple.c:.*
 EVT_MISC_INIT_F       sandbox_misc_init_f             .*start.c:'''
     assert re.match(expect, out, re.MULTILINE) is not None