ANDROID: Incremental fs: Remove unneeded compatibility typedef

Bug: 133435829
Test: builds, incfs_test passes
Change-Id: I9b2ad81d230009daadf2c30f3609fda16e79028c
Signed-off-by: Paul Lawrence <paullawrence@google.com>

fs/incfs/vfs.c

@@ -31,9 +31,6 @@
 #define READ_EXEC_FILE_MODE 0555
 #define READ_WRITE_FILE_MODE 0666
 
-/* Needed for kernel 4.14 - remove for later kernels */
-typedef unsigned int __poll_t;
-
 static int incfs_remount_fs(struct super_block *sb, int *flags, char *data);
 
 static int dentry_revalidate(struct dentry *dentry, unsigned int flags);