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.