[1.3 cherry-pick] [nrfconnect] Optimize packet buffer size #83303

Job	Run time
Build framework (macos-release-availability, -sdk macosx -configuration Release OTHER_CFLAGS='$...	15m 48s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	21m 2s
Run framework tests (asan-global-storage, -enableAddressSanitizer YES -enableUndefinedBehaviorSan...	22m 58s
Build framework (ios-release, -sdk iphoneos -configuration Release OTHER_CFLAGS='${inherited} -We...	11m 49s
Run framework tests (tsan, -enableThreadSanitizer YES)	24m 55s
Build TV Casting Bridge example	17m 25s
Build framework (ios-debug, -sdk iphoneos -configuration Debug OTHER_CFLAGS='${inherited} -Werr...	13m 1s
Build framework (tvos-debug, -sdk appletvos -configuration Debug OTHER_CFLAGS='${inherited} -Wer...	11m 55s
Build framework (watchos-debug, -sdk watchos -configuration Debug OTHER_CFLAGS='${inherited} -...	13m 32s
Build Darwin	2s
	2h 32m 27s

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