ACPI: Refactor use of global and device NVS

After ChromeOS NVS was moved to a separate allocation and the use
of multiple OperationRegions, maintaining the fixed offsets is not
necessary.

Use actual structure size for OperationRegions, but align the
allocations to 8 bytes or sizeof(uint64_t).

Change-Id: I9c73b7c44d234af42c571b23187b924ca2c3894a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51639
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/acpi/Kconfig

@@ -30,9 +30,6 @@ config ACPI_SOC_NVS
 	  Set to indicate <soc/nvs.h> exists for the platform with a definition
 	  for global_nvs.
 
-config ACPI_HAS_DEVICE_NVS
-	bool
-
 config ACPI_NO_PCAT_8259
 	bool
 	help