OvmfPkg: BDS: optimize second argument in PlatformBdsEnterFrontPage() call

OvmfPkg: BDS: optimize second argument in PlatformBdsEnterFrontPage() call

The second parameter of said function is "ConnectAllHappened", and if set
to TRUE, the function sets "gConnectAllHappened" to TRUE.

This global variable in turn controls whether Intel BDS code *itself*
calls BdsLibConnectAllDriversToAllControllers() in various places -- if
the indicator is TRUE, then the "connect all" is assumed to have been
performed, and Intel BDS doesn't do it itself.

OVMF should pass TRUE as "ConnectAllHappened", because a few lines before
our call to PlatformBdsEnterFrontPage(), we already connect everything
with BdsLibConnectAll(), which includes the effects of
BdsLibConnectAllDriversToAllControllers():

PlatformBdsPolicyBehavior()                   [OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c]
  BdsLibConnectAll()                          [IntelFrameworkModulePkg/Library/GenericBdsLib/BdsConnect.c]
    BdsLibConnectAllDriversToAllControllers()
  PlatformBdsEnterFrontPage()                 [IntelFrameworkModulePkg/Universal/BdsDxe/FrontPage.c]

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16308 6f19259b-4bc3-4df7-8a09-765794883524