ANDROID: fuse-bpf: Get correct inode in mkdir

We were getting the inode with the parent inode info
Also change variable names to remove confusion
Also set bpf correctly in new inode

Bug: 293838958
Bug: 305834539
Test: fuse_test, atest ScopedStorageDeviceTest,
	atest CtsScopedStorageHostTest
Change-Id: I0b6a6951599e0d211afd2243daacb98679503448
Signed-off-by: Paul Lawrence <paullawrence@google.com>
(cherry picked from commit 8fb9de08)