ACPI: Drop redundant CBMEM_ID_ACPI_GNVS allocations

Allocation now happens prior to device enumeration. The
step cbmem_add() is a no-op here, if reached for some
boards. The memset() here is also redundant and becomes
harmful with followup works, as it would wipe out the
CBMEM console and ChromeOS related fields without them
being set again.

Change-Id: I9b2625af15cae90b9c1eb601e606d0430336609f
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48701
Reviewed-by: Lance Zhao
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/acpi/Kconfig b/src/acpi/Kconfig
index 11ef12a3..293c194 100644
--- a/src/acpi/Kconfig
+++ b/src/acpi/Kconfig
@@ -24,6 +24,12 @@
 	  Provide common definitions for Intel hardware PM1_CNT register sleep
 	  values.
 
+config ACPI_SOC_NVS
+	bool
+	help
+	  Set to indicate <soc/nvs.h> exists for the platform with a definition
+	  for global_nvs.
+
 config ACPI_NO_PCAT_8259
 	bool
 	help