FreeBSD Snapdragon X1E-78-100

@dexter Revisiting the ThinkPad T14s Snapdragon with FreeBSD 15, here's where I left off. Do you know if there's been substantial momentum for the chipset (iirc, similar underlying requirements for your X13s)?

Two items stand out from my perspective, which may point to missing aspects in the "Fixed ACPI Description Table (FADT)", which should map the HPET .. hmmm..

1. No PSCI/SNCCC call function found
2. panic: No usable event timer found!

@crest this might be of interest?

From the original discussion months ago, some aspects from Linux World, specific to the X1E, which .. while not new-news etc etc you know where this goes... perhaps references something-something technical aspects. The T13s has almost full support for hardware enablement on 6.12/13 and branched.

- https://aarch64-laptops.github.io/
- https://github.com/aarch64-laptops/aarch64-laptops.github.io/blob/main/_laptop/thinkpad_t14s.md
- https://github.com/aarch64-laptops/aarch64-laptops.github.io/blob/main/_laptop/thinkpad_x13s.md
- https://git.codelinaro.org/linaro/qcomlt/demos/debian-12-installer-image

FreeBSD verbose boot output:

```
No PSCI/SNCCC call function found
Enabling DIC à IDC ICache sync
Enabling LSE atomics in the kernel
Enabling BT1
randon: registering fast source Brave rndr RHG
randon: fast provider: "Brave rndr RNG"
randon: no preloaded entropy cache
randon: read 2848 bytes from platform bootloader
randon: unblocking device.
VIMAGE (virtualized network stack) enabled
hostuuid: using 88888888-8888-8888-8888-888888888888
ULE: setup cpu

random: entropy device external interface
feeder_register: snd unit=-1 snd_saxautovchans-16 latency 2 feeder_rate_ain-1 feeder_rate_nox-2816888 feeder_rate_round-25
firmware: "tegra218 xush fu' version 8: 132688 bytes loaded at @xffff080088b2c658

kbde et kbdn
nes: <nesory>
null: (full device, null device, zero device>
openfira: <Open Firmware control device>
top_log: top_log device
crypto: <crypto core>
Device configuration finished.
procfs registered
panic: No usable event timer found!
cpuid = 8
tine 1

KDB: stack backtrace:
db_trace_self) at db_trace_self
do_trace_self urapper() at db_trace_self_urapper+0x38
vpanic() at vpanic-Bxiac
panic() at panic-x48
cpu_initclocks bsp() at cpu_initclocks_bsp+b5f4
initclocks() at initclocks Bbx28
ai startup() at ni startup-bddc
virtdone() at virtdone x6c
KDB: enter: panic
I thread pid B tid 199000 1
Stopped at kob_enter+x48: str хаг, (x19, 12848)
```

> Note: The log output was screen grabbed from the attached image, using Google Gemini to identify the text for copy/paste. There are some conversion aspects which are likely not fully correct, but it's rather helpful vs not using automated OCR.