sched/clock: call up_timer_gettime() to get higher resolution

[GUIDINGLI]

Summary

This is continue work of #15038

sched/clock: call up_timer_gettime() to get higher resolution
driver/timers: remove wall clock diff from lower half
Some SOC chipsets use global clock generator to unify the time of each MCU,
that means after MCUs is start-up, the timer will not start counting from 0.
this PR will record the wall timer of global timer and recalculate the ticks.

Impact
N/A

Testing
ci-check

[nuttxpr]

[Experimental Bot, please feedback here]

No, this PR does not fully meet the NuttX requirements as described. While it provides a link to prior work and a brief explanation, it lacks crucial details.

Here's what's missing:

• Summary: Needs more detail. How does up_timer_gettime() provide higher resolution? What is the "wall clock diff" and why is its removal important? The explanation about the global clock generator is helpful, but more detail on the recalculation of ticks is needed.
• Impact: Simply stating "N/A" is insufficient. Consider each point individually. Even if there's no impact, explicitly state "NO" for each category. The changes described likely impact hardware and drivers, so claiming no impact is questionable.
• Testing: "ci-check" is not sufficient. Provide actual log output before and after the change, demonstrating the improvement. Also specify the Build Host(s) and Target(s) used for testing. Simply stating "ci-check" doesn't convey what was tested or the results.

The PR needs substantial improvement in providing specific details for each of the required sections to meet the NuttX guidelines.

[anchao]

I have made similar changes before, but the problems are:

1. system tick will not start from 0, which will affect programs that need to use CLOCK_MONOTONIC
2. The acquisition of ticks will consume more CPU cycles (g_system_ticks -> up_timer_gettime and clock_ticks2time)
3. g_system_ticks may no need any more and which will to be removed in most scenarios

[anchao]

let us keep moving, @GUIDINGLI please fix the build break

[anchao]

@xiaoxiang781216