Workaround perdev_minors path change in Linux

This upstream Linux change has been discussed at https://patchwork.kernel.org/patch/8281851/
And included in AOSP in https://android-review.googlesource.com/c/kernel/common/+/202752
Some devices have been released without it, so we need this change to
have a working SDcard on those devices.

Change-Id: I323d85bd8381f82b75db09493ddc22f432cec548