timekeeping/vsyscall: Use __iter_div_u64_rem()
On 32-bit x86 when building with clang-9, the 'division' loop gets turned back into an inefficient division that causes a link error: kernel/time/vsyscall.o: In function `update_vsyscall': vsyscall.c:(.text+0xe3): undefined reference to `__udivdi3' Use the existing __iter_div_u64_rem() function which is used to address the same issue in other places. Fixes: 44f57d78 ("timekeeping: Provide a generic update_vsyscall() implementation") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Link: https://lkml.kernel.org/r/20190710130206.1670830-1-arnd@arndb.de
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