Address nightly failure in Azure Sphere

[padelsbach]

Description

1. Enable HAVE_SERVER_RENEGOTIATION_INFO by default for renegotation_info in user_settings.h
2. Include stat.h only when used in wc_port.c

C:/jenkins/workspace/wolfSSL/nightly-Azure-Sphere-MT3620-mini-v2/wolfcrypt/src/wc_port.c:5745:10: fatal error: sys/stat.h: No such file or directory
 5745 | #include <sys/stat.h>
      |          ^~~~~~~~~~~~

Testing

Manual CI run

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• gcc-arm-cortex-m0plus
• gcc-arm-cortex-m3
• gcc-arm-cortex-m4
• gcc-arm-cortex-m4-baremetal
• gcc-arm-cortex-m4-crypto-only
• gcc-arm-cortex-m4-dtls13
• gcc-arm-cortex-m4-min-ecc
• gcc-arm-cortex-m4-openssl-compat
• gcc-arm-cortex-m4-pkcs7
• gcc-arm-cortex-m4-pq
• gcc-arm-cortex-m4-rsa-only
• gcc-arm-cortex-m4-sp-math
• gcc-arm-cortex-m4-tls12
• gcc-arm-cortex-m4-tls13
• gcc-arm-cortex-m7
• gcc-arm-cortex-m7-pq
• gcc-arm-cortex-m7-tls13
• linuxkm-pie
• linuxkm-standard
• stm32-sim-stm32h753