ACPI: Separate device_nvs_t

Remove typedef device_nvs_t and move struct device_nvs
outside of global_nvs. Also remove padding and the reserve
for chromeos_acpi_t.

Change-Id: I878746b1f0f9152a27dc58e373d58115e2dff22c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49476
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/acpi/Kconfig

@@ -30,6 +30,9 @@ 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