Vlv2TbltDevicePkg: Display logo on BOOT_ON_FLASH_UPDATE

Vlv2TbltDevicePkg: Display logo on BOOT_ON_FLASH_UPDATE

https://bugzilla.tianocore.org/show_bug.cgi?id=911

Update PlatformBdsLib to show boot logo when the boot
mode is BOOT_ON_FLASH_UPDATE.

Cc: David Wei <david.wei@intel.com>
Cc: Mang Guo <mang.guo@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: David Wei <david.wei@intel.com>