Rename the internal ULP child-build marker to __ULP_BUILDV2 so component CMake files make the build-system scope explicit.
Document that the marker is currently set only by the IDF_BUILD_V2 ULP child path.
Move chip-specific LL headers from the hal component to their respective
component directories:
- lp_spi_ll.h (esp32p4, esp32s31) -> esp_hal_gpspi
- sar_ctrl_ll.h (all chips) -> esp_hal_ana_conv
Move per-target GPSPI regdma retention descriptors out of esp_hal_gpspi
and
into esp_driver_spi so the driver owns its backup scope and restore
sequence.
freq_limit was declared at the top of the #if SPI_LL_SUPPORT_TIME_TUNING
block and only consumed by HAL_EARLY_LOGE inside an inner if(). When the
log macro expands to nothing (e.g. log component absent from the build
closure, as in g0_components, or log level set below ERROR), the
variable became unused and tripped -Wunused-variable, failing builds
under --check-warnings.
Move the declaration into the inner if() that calls HAL_EARLY_LOGE so
it shares the same scope and lifetime as its consumer.
Commit 64704886b7 (refactor(driver_spi): remove some SPI_LL_xxx SOC_xxx macros)
removed #include "soc/spi_periph.h" from hal/spi_hal.h. Out-of-tree code that
included hal/spi_hal.h and used spi_periph_signal then failed with the symbol
undeclared, because that header had been the transitive source of the declaration.
Partially reverts it.
