test: acpi: Fix warnings on 32-bit build

Some format strings use the wrong type. Fix them.

Example warnings:

In file included from test/dm/acpi.c:22:
test/dm/acpi.c: In function ‘dm_test_acpi_cmd_list’:
test/dm/acpi.c:362:21: warning: format ‘%lx’ expects argument of type
  ‘long unsigned int’, but argument 4 has type ‘unsigned int’ [-Wformat=]
  ut_assert_nextline("RSDP %08lx %06lx (v02 U-BOOT)", addr,
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       sizeof(struct acpi_rsdp));
       ~~~~~~~~~~~~~~~~~~~~~~~~
include/test/ut.h:282:33: note: in definition of macro ‘ut_assert_nextline’
  if (ut_check_console_line(uts, fmt, ##args)) {   \
                                 ^~~

Signed-off-by: Simon Glass <sjg@chromium.org>