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
Test: fuse_test, atest ScopedStorageDeviceTest,
	atest CtsScopedStorageHostTest
Signed-off-by: Paul Lawrence <paullawrence@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:12eb00420cad77d7b7fcfbd1088c921ae629e69d)
Merged-In: I0b6a6951599e0d211afd2243daacb98679503448
Change-Id: I0b6a6951599e0d211afd2243daacb98679503448