Kernel: Mark sys$map_time_page as not needing the big lock

All accesses to shared mutable data are already serialized behind the
process address space spinlock.

Kernel/API/Syscall.h

@@ -122,7 +122,7 @@ enum class NeedsBigProcessLock {
     S(listen, NeedsBigProcessLock::No)                     \
     S(lseek, NeedsBigProcessLock::No)                      \
     S(madvise, NeedsBigProcessLock::No)                    \
-    S(map_time_page, NeedsBigProcessLock::Yes)             \
+    S(map_time_page, NeedsBigProcessLock::No)              \
     S(mkdir, NeedsBigProcessLock::No)                      \
     S(mknod, NeedsBigProcessLock::No)                      \
     S(mmap, NeedsBigProcessLock::Yes)                      \

Kernel/Syscalls/clock.cpp

@@ -12,7 +12,7 @@ namespace Kernel {
 
 ErrorOr<FlatPtr> Process::sys$map_time_page()
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     TRY(require_promise(Pledge::stdio));
 
     auto& vmobject = TimeManagement::the().time_page_vmobject();