Merge "Replace security_context_t type" am: 530329222f am: cdbde55e7b am: 0bef24b06b am: 1d40040766

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1824052

Change-Id: Ie0b44ea22f3cbaf269906adc061d563c50d2ac82