drivers/intel/fsp2_0: Link Post PCI enumeration Notify with BS_DEV_ENABLE

drivers/intel/fsp2_0: Link Post PCI enumeration Notify with BS_DEV_ENABLE

This patch to ensure that coreboot is able to store memory
training data into SPI and perform platform lockdown after
PCI enumeration is done before handing over control to
NotifyPhase() - Post PCI enumeration.

Modified coreboot bootstate execution order below:

BS_DEV_ENUMERATE - BS_ON_EXIT - Store Memory training data into SPI
BS_DEV_RESOURCES - BS_ON_EXIT - Platform Lock Down after PCI enumeration
BS_DEV_ENABLE - BS_ON_ENTRY - NotifyPhase() post PCI enumeration

TEST=Please find test case and results for Chrome Devices as Apollolake- Reef,
Kabylake-Eve and Poppy and Non Chrome Devices with Yocto OS.

1.
Without patches
Cold Boot
MRC: no data in 'RW_MRC_CACHE'

...

MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: no data in 'RW_MRC_CACHE'
MRC: cache data 'RW_MRC_CACHE' needs update.
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.

Warm Reboot from Chrome CMD Line: $ reboot
MRC cache found, size 18c8 bootmode:2

...

MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.

Suspend Stress from Chrome CMD Line: $ echo mem > /sys/power/state
MRC cache found, size 18c8 bootmode:17

...

MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.

2.
With patches
Cold Boot
MRC: no data in 'RW_MRC_CACHE'

...

MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: no data in 'RW_MRC_CACHE'
MRC: cache data 'RW_MRC_CACHE' needs update.
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.

Warm Reboot from Yocto CMD Line: $ reboot
MRC cache found, size 18c8 bootmode:2

...

MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.

Suspend Stress from Chrome CMD Line: $ echo mem > /sys/power/state
MRC cache found, size 18c8 bootmode:17

...

MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.

Tested the patches more thoroughly, from the S5->S0, S3->S0 bootlog there
is no noticeable difference.

On a reboot, suspend resume from Chrome console, the mrc cache is found,
and utilized.

Change-Id: I4cb4eac5256c1ce98f51adad0be6e69f7d05d8e1
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/21084
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>