sync(upstream): integrate Batch 25 pad latching, DPP row scans, and libc extensions - #545

Summary

Integrates Upstream Sync Batch 25 (10 PRs from boykopovar/AnyPS5):

• PR fix(pad): report a press that ends before the next pad read boykopovar/AnyPS5#7059: fix(pad): report a press that ends before the next pad read
• PR fix(shader): reduce a DPP row scan read at a row's last lane over the… boykopovar/AnyPS5#7343: fix(shader): reduce a DPP row scan read at a row's last lane
• PR feat(libSceAudioOut): implement sceAudioOutGetSystemState boykopovar/AnyPS5#5965: feat(libSceAudioOut): implement sceAudioOutGetSystemState
• PR fix(audio-propagation): preserve existing destination mixes boykopovar/AnyPS5#6513: fix(audio-propagation): preserve existing destination mixes
• PR fix(libkernel): name module-relative call sites and thread ids in Linux wait traces boykopovar/AnyPS5#7338: fix(libkernel): name module-relative call sites and thread ids in Linux wait traces
• PR feat(libc): implement wcscspn, wcstoimax, wcstoumax, strtouq, rindex and flsl boykopovar/AnyPS5#7356: feat(libc): implement wcscspn, wcstoimax, wcstoumax, strtouq, rindex and flsl
• PR feat(libc): implement mergesort boykopovar/AnyPS5#7353: feat(libc): implement mergesort
• PR feat(libSceLibcInternal): implement the remaining posix_spawnattr accessors boykopovar/AnyPS5#7349: feat(libSceLibcInternal): implement the remaining posix_spawnattr accessors
• PR feat(libc): implement the sceLibcPafMspace allocation exports boykopovar/AnyPS5#7348: feat(libc): implement the sceLibcPafMspace allocation exports
• PR feat(libc): implement seed48 and lcong48 boykopovar/AnyPS5#7357: feat(libc): implement seed48 and lcong48

Verification

• Conventions checked: zero comments policy upheld
• Rosetta test suite: 25/25 passed (100%)
• Metal native test suite: 63/63 passed (100%)