EmbeddedPkg/FdtPlatformDxe: 'setfdt' command, add deletion of the UEFI variable ...

EmbeddedPkg/FdtPlatformDxe: 'setfdt' command, add deletion of the UEFI variable "Fdt"

Add deletion of the "Fdt" UEFI variable used to specify
a development FDT device path when the 'setfdt' command
is called with an empty string as file path.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ronald Cron <Ronald.Cron@arm.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17300 6f19259b-4bc3-4df7-8a09-765794883524