defconfig: arm64: enable required configs for trusted VM

Enable initramfs and dcc support configs for LE VM and remove
unnecessary RTC drivers. Also enable the virtualization drivers,
such as Resource Manager driver, message queue driver and
doorbell for trusted VM.

Change-Id: Ia93caecd609f58a6d6cdb8f752e8ce5360f14c9d
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>