[ESP32]fix get wrong MAC on SoftAP mode

[wqx6]

Problem

The hostname is wrong when the Rendezvous Mode is SoftAP because GetPrimaryWiFiMACAddress gets wrong MAC.

Change overview

Fix above problem

Testing

Tested manually with avahi-browse after connecting the SoftAP.

[chshu]

Required to pass TE3 3.4.1 step5.

[github-actions]

Size increase report for "esp32-example-build" from 90592a7

File	Section	File	VM
chip-all-clusters-app.elf	.flash.text	84	84

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize
.debug_info,0,564
.debug_line,0,140
.flash.text,84,84
.debug_str,0,80
.strtab,0,66
.debug_abbrev,0,60
.debug_loc,0,52
.debug_ranges,0,32
.debug_frame,0,24
.symtab,0,16
.debug_aranges,0,8
.shstrtab,0,2

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize