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Move (un)map_flash_region function pointers from programmer_entry to par_master, spi_master, and opaque_master. This enables programmers to specify a different mapper per bus, which is needed for the internal programmer. Mapping is closely tied to the way the memory is accessed using the other functions in the bus master structs. Validate that FWH/LPC programmers provide specialized mapping in register_par_master(); this is needed for chips with FEATURE_REGISTERMAP, which only exist on FWH or LPC buses. programmer.c: Update comment in fallback_map(), NULL return is the desired behavior. Test: Read firmware on SB600 Promontory mainboard (requires physmap) Test: Read firmware externally with ft2232_spi Test: Read firmware on ICH hwseq, verify physmap still occurs Change-Id: I9c3df6ae260bcdb246dfb0cd8e043919609b014b Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm> Co-Authored-by: Edward O'Callaghan <quasisec@google.com> Reviewed-on: https://review.coreboot.org/c/flashrom/+/67695 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>