[fuchsia] Removed unused FVM_TYPE_* constants

Added in https://crrev.com/c/1030951, they are no longer used.

Change-Id: I262060a2e946b9671e3179035987e0ab690c114e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583482
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836261}

build/fuchsia/boot_data.py

@@ -30,9 +30,6 @@ Host *
   ConnectTimeout 5
   """
 
-FVM_TYPE_QCOW = 'qcow'
-FVM_TYPE_SPARSE = 'sparse'
-
 # Specifies boot files intended for use by an emulator.
 TARGET_TYPE_QEMU = 'qemu'