genfs_contexts: fix path for st21nfc i2c devices

Due to recent changes which modifies the device name for i2c devices,
st21nfc device names are now changed from ?-0008 to "i2c-st21nfc"

Bug: 188078957
Test: Verified haptic works and no avc denials when running following command:
$ dmesg | grep avc | grep sysfs
Signed-off-by: Manish Varma <varmam@google.com>
Change-Id: I17464d2d01fb64447dd8828eb8f91e38717fac4c
1 file changed