soc-qcom-sdm845: fix dependency typo of -vulkan subpackage

Fixes:

ERROR: unable to select packages:
  mesa-vulkan-freedreeno (no such package):
    required by: soc-qcom-sdm845-vulkan-9-r0[mesa-vulkan-freedreeno]

Reference: https://pkgs.alpinelinux.org/package/edge/main/aarch64/mesa-vulkan-freedreno

This problem was introduced in !3494 (merged).

Cc. @calebccff @ollieparanoid