Surface: Fix gralloc flags conflicting values.

Due to some custom code, unwanted flags (HW) got added with SW flags.
Restrict the flags to custom ones.

Change-Id: I2ab1c75eef4d6d16f0dd7d43aff3c7377486801a
sf: virtual display clean up

  Since HAL allows Virtual devices, remove virtual display id
  check during setup of virtual display.

Change-Id: I6ec93c0f06842b69e6677f05ae8b45fb1f4225f6