region: Turn region_end() into an inclusive region_last()

The current region_end() implementation is susceptible to overflow
if the region is at the end of the addressable space. A common case
with the memory-mapped flash of x86 directly below the 32-bit limit.

Note: This patch also changes console output to inclusive limits.
IMO, to the better.

Change-Id: Ic4bd6eced638745b7e845504da74542e4220554a
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79946
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

util/cbfstool/cbfstool.c

@@ -423,9 +423,9 @@ static bool create_mmap_windows(void)
 						   &mmap_window_table[j].flash_space)) {
 					ERROR("Flash space windows (base=0x%zx, limit=0x%zx) and (base=0x%zx, limit=0x%zx) overlap!\n",
 					      region_offset(&mmap_window_table[i].flash_space),
-					      region_end(&mmap_window_table[i].flash_space),
+					      region_last(&mmap_window_table[i].flash_space),
 					      region_offset(&mmap_window_table[j].flash_space),
-					      region_end(&mmap_window_table[j].flash_space));
+					      region_last(&mmap_window_table[j].flash_space));
 					return false;
 				}
 
@@ -433,9 +433,9 @@ static bool create_mmap_windows(void)
 						   &mmap_window_table[j].host_space)) {
 					ERROR("Host space windows (base=0x%zx, limit=0x%zx) and (base=0x%zx, limit=0x%zx) overlap!\n",
 					      region_offset(&mmap_window_table[i].flash_space),
-					      region_end(&mmap_window_table[i].flash_space),
+					      region_last(&mmap_window_table[i].flash_space),
 					      region_offset(&mmap_window_table[j].flash_space),
-					      region_end(&mmap_window_table[j].flash_space));
+					      region_last(&mmap_window_table[j].flash_space));
 					return false;
 				}
 			}