Merge "BSD grep doesn't support -P" am: 3ad0c61146 am: 6e008cbb2a am: 39465971f4

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1891500

Change-Id: I4af27181e9739553d5395eddac05f96038d7e634

tools/aosp/aosp_sha.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 LOCAL_DIR="$( dirname "${BASH_SOURCE}" )"
 
-if git branch -vv | grep -q -P "^\*[^\[]+\[aosp/"; then
+if git branch -vv | grep -q -E "^\*[^\[]+\[aosp/"; then
     # Change appears to be in AOSP
     exit 0
 elif git log -n 1 --format='%B' $1 | grep -q -E "^Ignore-AOSP-First: .+" ; then