Android: Set angle_enable_commit_id=false in roll_aosp.sh

The current roll_aosp.sh is generating an invalid Android.bp by
including the local repo's .git file:

cc_genrule {
    name: "angle_commit_id",
    tool_files: [
        "src/commit_id.py",
    ],
    cmd: "$(location) gen $(location commit.h)",
    srcs: [
        ".git/refs/heads/rollAngle",
    ],
    sdk_version: "28",
    out: [
        "commit.h",
    ],
}

This is fixed by enabling the GN arg 'angle_enable_commit_id=false' in
the script:

cc_genrule {
    name: "angle_commit_id",
    tool_files: [
        "src/commit_id.py",
    ],
    cmd: "$(location) gen $(location commit.h)",
    sdk_version: "28",
    out: [
        "commit.h",
    ],
}

Bug: angleproject:5050
Test: Manual verification in AOSP checkout
Change-Id: I08a08084c4c25411b29b22544c2ed8c06f6f54d8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2412790
Reviewed-by: Geoff Lang <geofflang@chromium.org>

scripts/roll_aosp.sh

@@ -74,6 +74,8 @@ for abi in ${abis[@]}; do
         "angle_enable_essl = true" # TODO(geofflang): Disable ESSL once Andrid no longer requires it. anglebug.com/4444
         "angle_enable_glsl = true" # TODO(geofflang): Disable ESSL once Andrid no longer requires it. anglebug.com/4444
         "angle_enable_hlsl = false"
+
+        "angle_enable_commit_id = false"
     )
 
     gn gen ${GN_OUTPUT_DIRECTORY} --args="${gn_args[*]}"