[DPDK/core Bug 1409] arparse library assumes enum are 64 bit

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1409

            Bug ID: 1409
           Summary: arparse library assumes enum are 64 bit
           Product: DPDK
           Version: 24.03
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev at dpdk.org
          Reporter: stephen at networkplumber.org
  Target Milestone: ---

MSVC correctly flags that this line in rte_argparse.h is incorrect:
        RTE_ARGPARSE_ARG_RESERVED_FIELD = RTE_GENMASK64(63, 48),

The problem is that enum values are just an alias for int, and it can be 32
bits.

Taken from the current C Standard (C99):
 http://www.open std.org/JTC1/SC22/WG14/www/docs/n1256.pdf

6.7.2.2 Enumeration specifiers
[...]
Constraints
The expression that defines the value of an enumeration constant shall be an
integer constant expression that has a value representable as an int.
[...]
Each enumerated type shall be compatible with char, a signed integer type, or
an unsigned integer type. The choice of type is implementation-defined, but
shall be capable of representing the values of all the members of the
enumeration.

Since rte_argparse only uses 10 bits now. The suggested fix here is to:
   1. Assume 32 bits
   2. Get rid of the reserved field - reserved fields are bad idea

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