tests: Unit tests for erase function selection algo

The test checks that algorithm for erase functions selection
works and there are no regressions.

Specifically, test contains an array of test cases. Each case
initialises a given initial state of the memory for the mock chip,
and layout regions on the chip, and then performs erase and write
operations.
At the end of operation, test asserts the following:
- the state of mock chip memory is as expected, i.e. properly erased
  or written
- erase blocks are invoked in expected order and expected number
  of them
- chip operation (erase or write) returned 0.

Change-Id: I8f3fdefb76e71f6f8dc295d9dead5f38642aace7
Signed-off-by: Anastasia Klimchuk <aklm@flashrom.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Peter Marheine <pmarheine@chromium.org>

tests/meson.build

@@ -24,6 +24,7 @@ test_srcs = files(
   'chip_wp.c',
   'selfcheck.c',
   'io_real.c',
+  'erase_func_algo.c',
 )
 
 if not programmer.get('dummy').get('active')