[test/hal] adc oneshot/temperature: wait for async completion

[liangyongxiang]

Draft — not yet tested on hardware.

Summary

vsf_adc_channel_request_once is an asynchronous API: the conversion
result is delivered via the VSF_ADC_IRQ_MASK_CPL ISR callback, not by the
time the call returns.

The adc_oneshot and adc_temperature test suites registered no ISR
(cfg.isr = {NULL, NULL, 0}) and read the sample immediately after the
request — i.e. they used the async API as if it were synchronous.

Change

Mirror the correct pattern already used by vsf_test_adc_stream.c:

• register a completion ISR that sets a volatile bool flag on VSF_ADC_IRQ_MASK_CPL;
• clear the flag before the request;
• VSF_TEST_WAIT_FOR(...) the conversion-complete interrupt before reading the sample.

Also add per-suite ..._PRIO (vsf_arch_prio_1) and ..._TIMEOUT_MS (500)
config defaults (overridable), matching the stream suite's convention.

Files:

• test/.../adc/suite/vsf_test_adc_oneshot.c / .h
• test/.../adc/suite/vsf_test_adc_temperature.c / .h

Status / TODO

• Build
• Run on target hardware and confirm both suites pass

Kept as a draft until the above verification is done.