Allow the kernel to read shell_data_file

In ApexTestCases, a temp file in /data/local/tmp is used via a loop
device, which requires the kernel to read it.

This is only allowed in userdebug/eng.

Bug: 192259606
Test: ApexTestCases
Change-Id: Ic7d3e67a8a3e818b43b7caead9053d82cbcbccf7
1 file changed