tools: mips-relocs: replace format string introducers

tools: mips-relocs: replace format string introducers

The statement that prints the ELF object type value assumes that "%lx"
(long unsigned int, hexadecimal) is suitable for printing a uint64_t
typed value. While this may seem to work for some machines, ie. amd64,
it isn't ideal on a 32-bit system, such as x86 where uint64_t is likely
to be equivalent to a long long unsigned int, as indicated by:

  ../tools/mips-relocs.c:275:34:
  warning: format '%lx' expects argument of type 'long unsigned int',
           but argument 2 has type 'uint64_t'
           {aka 'long long unsigned int'} [-Wformat=]
  275 |                 printf("type 0x%lx\n", ehdr_field(e_type));
      |                                ~~^
      |                                  |
      |                                  long unsigned int
      |                                %llx

As the ehdr_field function-like macro expands to a uint64_t value,
it is better to use the PRIx64 macro in place of "%lx" to ensure that
the correct format string introducer is specified for the actual type
hiding behind uint64_t.

A similar issue is also present in the report of .rel section overflow,
where "%lx" is used to print a few size_t typed values, and would be
better served by "%zx" instead.

Signed-off-by: Justin Swartz <justin.swartz@risingedge.co.za>
Fixes: 963014641117 ("MIPS: make size of relocation table fixed but configurable")
Fixes: 703ec9ddf965 ("MIPS: Stop building position independent code")
Cc: Paul Burton <paulburton@kernel.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>