[sw] Fix chip_info location in test_rom

The `chip_info` structure is currently located inconsistently between
the `mask_rom` and `test_rom`. In `mask_rom`, it resides in the last
128 bytes, but in `test_rom`, it's offset by an additional 32 bytes
(to `last 160 bytes`).

Given `chip_info`'s small size (12 bytes), it can safely occupy bytes
116-128 from the end of the ROM, leaving the final 32 bytes (0-31) for
the scrambling tool's digest.

This change aligns `test_rom`'s `chip_info` placement with `mask_rom`'s.

Change-Id: I10bde4d9b856511030c34ed373569eaa00c8af04
Signed-off-by: Yi-Hsuan Deng <[email protected]>
Signed-off-by: Amaury Pouly <[email protected]>

Author: pamaury

sw/device/lib/testing/test_rom/test_rom.ld

@@ -31,9 +31,6 @@ _rom_ext_virtual_size = LENGTH(rom_ext_virtual);
 ASSERT((_rom_ext_virtual_size <= (LENGTH(eflash) / 2)),
   "Error: rom ext flash is bigger than slot.");
 
-_rom_digest_size = 32;
-_chip_info_start = ORIGIN(rom) + LENGTH(rom) - _rom_digest_size - _chip_info_size;
-
 /* DV Log offset (has to be different to other boot stages). */
 _dv_log_offset = 0x0;