arm-bsp-extras: Convert Capsule Update partition to ESP type

Convert the partition in efi-capsule-update-disk image to EFI System
Partition (ESP) type for Arm SystemReady IR ACS test.
Otherwise, the related UEFI-SCT tests can fail.

  - Change partition type to 0xEF.
  - Remove the label of the Capsule Update partition. Otherwise, ACS
    test will dump some test results to Capsule Update partition rather
    than the BOOT partition of ACS image.
  - Update the dependency to make sure the Capsule Update image is
    deployed.

Signed-off-by: David Hu <david.hu2@arm.com>