ni-utils: Allow fw_setenv to take hyphens inside variable name or value
ni-utils: Allow fw_setenv to take hyphens inside variable name or value

Signed-off-by: Alexandru But <b0bc25d88e94f615c93d8872713b25cc95bc8b06@ni.com>
Acked-by: Joshua Hernstrom <32dc8cfec5c07c8b12607232c3deac1c85064218@ni.com>
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Natinst-ReviewBoard-ID: 91428

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt