CorebootPayloadPkg/CbSupportPei: Fix the memory map issue

CorebootPayloadPkg/CbSupportPei: Fix the memory map issue

When coreboot reports memory range across 1MB, the current code
cannot handle it properly. In this case the range should be
adjusted to start from 1MB instead since the memory resource
below 1MB has been preprocessed by CbSupportPei module.

This patch fixed the coreboot + UEFI payload hang issue when
running on QEMU due to incorrect memory map.

Cc: Prince Agyeman <prince.agyeman@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Maurice Ma <maurice.ma@intel.com>
Reviewed-by: Prince Agyeman <prince.agyeman@intel.com>