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>

src/soc/amd/picasso/Kconfig

@@ -17,6 +17,7 @@ config CPU_SPECIFIC_OPTIONS
 	select X86_AMD_FIXED_MTRRS
 	select X86_AMD_INIT_SIPI
 	select ACPI_AMD_HARDWARE_SLEEP_VALUES
+	select ACPI_SOC_NVS
 	select DRIVERS_I2C_DESIGNWARE
 	select DRIVERS_USB_PCI_XHCI
 	select GENERIC_GPIO_LIB