mm: remove pud_user() from asm-generic/pgtable-nopmd.h

Commit 2c8a81dc ("riscv/mm: fix two page table check related issues")
added pud_user() in include/asm-generic/pgtable-nopmd.h

But pud_user() only exists on ARM64 and RISCV and is not expected by any
part of MM.

Add the missing definition in arch/riscv/include/asm/pgtable-32.h and
remove it from asm-generic/pgtable-nopmd.h

Link: https://lkml.kernel.org/r/c31a39463929daba6c91917598ec05cf47103af5.1720597744.git.christophe.leroy@csgroup.eu


Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>