powerpc: add asm/stat.h to UAPI compile-test coverage

asm/stat.h is currently excluded from the UAPI compile-test for
ARCH=powerpc because of the errors like follows:

    HDRTEST usr/include/asm/stat.h
  In file included from <command-line>:32:
  ./usr/include/asm/stat.h:32:2: error: unknown type name 'ino_t'
     32 |  ino_t  st_ino;
        |  ^~~~~
  ./usr/include/asm/stat.h:35:2: error: unknown type name 'mode_t'
     35 |  mode_t  st_mode;
        |  ^~~~~~
  ./usr/include/asm/stat.h:40:2: error: unknown type name 'uid_t'
     40 |  uid_t  st_uid;
        |  ^~~~~
  ./usr/include/asm/stat.h:41:2: error: unknown type name 'gid_t'
     41 |  gid_t  st_gid;
        |  ^~~~~

The errors can be fixed by prefixing the types with __kernel_.

Then, remove the no-header-test entry from user/include/Makefile.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>

arch/powerpc/include/uapi/asm/stat.h

@@ -29,16 +29,16 @@ struct __old_kernel_stat {
 
 struct stat {
 	unsigned long	st_dev;
-	ino_t		st_ino;
+	__kernel_ino_t	st_ino;
 #ifdef __powerpc64__
 	unsigned long	st_nlink;
-	mode_t		st_mode;
+	__kernel_mode_t	st_mode;
 #else
-	mode_t		st_mode;
+	__kernel_mode_t	st_mode;
 	unsigned short	st_nlink;
 #endif
-	uid_t		st_uid;
-	gid_t		st_gid;
+	__kernel_uid_t	st_uid;
+	__kernel_gid_t	st_gid;
 	unsigned long	st_rdev;
 	long		st_size;
 	unsigned long	st_blksize;

usr/include/Makefile

@@ -66,7 +66,6 @@ no-header-test += linux/if_bonding.h
 endif
 
 ifeq ($(SRCARCH),powerpc)
-no-header-test += asm/stat.h
 no-header-test += linux/bpf_perf_event.h
 endif