Use <linux/fscrypt.h> from Bionic

aosp/1184798 has updated the kernel headers to 5.4, so we no longer need
the file fscrypt_uapi.h.  In KeyUtil.cpp we also now don't need
<linux/fs.h>, but rather just the more specific <linux/fscrypt.h>.

Test: build
Bug: None
Change-Id: I56d17826eb7c3b95c74ce0435a4feae7f3cc325e

KeyUtil.cpp

@@ -21,7 +21,7 @@
 #include <string>
 
 #include <fcntl.h>
-#include <linux/fs.h>
+#include <linux/fscrypt.h>
 #include <openssl/sha.h>
 #include <sys/ioctl.h>
 
@@ -31,7 +31,6 @@
 
 #include "KeyStorage.h"
 #include "Utils.h"
-#include "fscrypt_uapi.h"
 
 namespace android {
 namespace vold {

fscrypt_uapi.h

@@ -1,48 +0,0 @@
-#ifndef _UAPI_LINUX_FSCRYPT_H
-#define _UAPI_LINUX_FSCRYPT_H
-
-// Definitions for FS_IOC_ADD_ENCRYPTION_KEY and FS_IOC_REMOVE_ENCRYPTION_KEY
-
-// TODO: switch to <linux/fscrypt.h> once it's in Bionic
-
-#ifndef FS_IOC_ADD_ENCRYPTION_KEY
-
-#include <linux/types.h>
-
-#define FSCRYPT_KEY_DESCRIPTOR_SIZE 8
-#define FSCRYPT_KEY_IDENTIFIER_SIZE 16
-
-#define FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR 1
-#define FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER 2
-
-struct fscrypt_key_specifier {
-    __u32 type;
-    __u32 __reserved;
-    union {
-        __u8 __reserved[32];
-        __u8 descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];
-        __u8 identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];
-    } u;
-};
-
-struct fscrypt_add_key_arg {
-    struct fscrypt_key_specifier key_spec;
-    __u32 raw_size;
-    __u32 __reserved[9];
-    __u8 raw[];
-};
-
-struct fscrypt_remove_key_arg {
-    struct fscrypt_key_specifier key_spec;
-#define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY 0x00000001
-#define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS 0x00000002
-    __u32 removal_status_flags;
-    __u32 __reserved[5];
-};
-
-#define FS_IOC_ADD_ENCRYPTION_KEY _IOWR('f', 23, struct fscrypt_add_key_arg)
-#define FS_IOC_REMOVE_ENCRYPTION_KEY _IOWR('f', 24, struct fscrypt_remove_key_arg)
-
-#endif /* FS_IOC_ADD_ENCRYPTION_KEY */
-
-#endif /* _UAPI_LINUX_FSCRYPT_H */