Merge "Move external storage mkdir to ValidateInstallParams" am: 41ec4141a5

Original change: https://android-review.googlesource.com/c/platform/system/gsid/+/1596273

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0c11f2f206628ed5437c4a3dcadd35c80e9a09a8