soc/intel/elkhartlake: Fix PMC read_resources callback

The `limit` field for the PMC fixed BAR was incorrectly set to the `base
+ size + 1`, where it should be `base + size - 1`, to correctly tell the
allocator the limit.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Ib2d8c7ffe87fdd970f3172bb4e6b2c9386859ab3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65460
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/elkhartlake/pmc.c

@@ -76,7 +76,7 @@ static void soc_pmc_read_resources(struct device *dev)
 	res = new_resource(dev, 1);
 	res->base = (resource_t)ACPI_BASE_ADDRESS;
 	res->size = (resource_t)ACPI_BASE_SIZE;
-	res->limit = res->base + res->size + 1;
+	res->limit = res->base + res->size - 1;
 	res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
 }