intel/fsp_baytrail: Clear the GNVS area prior to filling

Zero out the GNVS area so that uninitialized portions are defined.

Tests using Microsoft Windows (XP/7/8) gave a bluescreen bugcheck: A5
(ACPI_BIOS_ERROR) with the first parameter (0x00001000)
(ACPI_BIOS_USING_OS_MEMORY). Some ACPI enumerated devices use the
GNVS area to define whether they're enabled and their MMIO regions.
On my custom baytrail-based board and build, these devices were
disabled but GNVS had uninitialized data indicating the devices
were enabled with improper MMIO regions.

Should investigate further to see where the GNVS device values are
set if enabled and make sure they're set to valid values even when
the devices are disabled via the mainboard/devicetree.cb.

Change-Id: I2b575c65bfaab58ae6206ac6f457c259c27a7d97
Signed-off-by: Scott Radcliffe <sradcliffe@microind.com>
Reviewed-on: http://review.coreboot.org/7040
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
baytrail: Add padding to the end of device_nvs to match ACPI

ACPI globalnvs.asl expects the gnvs memory area size to be 0x2000.
Padding has been added to device_nvs struct to reserve the full
0x2000 bytes for gnvs usage.

No known issues are caused by having the GNVS area shorter than
what ACPI thinks. Since there's nothing defined in this area,
O/S shouldn't try to access it. Only problem might be if O/S
notices the SSDT is located within the GNVS defined area.

I verified that the next table written to memory (SSDT) is 0x2000
past GNVS start using a custom-designed Baytrail-I motherboard
based on the Intel Bayley Bay CRB.

Change-Id: I9792954c7a3403eba6f37d7e53ea4a9ed3a2e4ac
Signed-off-by: Scott Radcliffe <sradcliffe@microind.com>
Reviewed-on: http://review.coreboot.org/7039
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
intel/fsp_baytrail: Add padding so device_nvs location matches ACPI

The offset of the device_nvs in the gnvs struct is expected to be
0x1000. It is actually 0x100 so padding is needed to move device_nvs
to the expected location. ACPI references to device_nvs objects will
be correct with the padding.

This was tested using a Micro Industries customized Baytrail-I board
based on the Intel Bayley Bay CRB. In intel/baytrail/nvs.h, there's
a Google customized structure located at 0x0100-0x0FFF that is
removed from the fsp_baytrail/nvs.h which explains the mismatch here.

Change-Id: I4721a79b53b5b3345ff9b0c053bdd31d2cf9cb61
Signed-off-by: Scott Radcliffe <sradcliffe@microind.com>
Reviewed-on: http://review.coreboot.org/7038
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>