kernel/process: Make process_id a 64-bit value

In the actual kernel, this is a 64-bit value, so we shouldn't be using a
32-bit type to handle it.

src/core/hle/kernel/kernel.cpp

@@ -155,7 +155,7 @@ struct KernelCore::Impl {
     std::atomic<u32> next_object_id{0};
     // TODO(Subv): Start the process ids from 10 for now, as lower PIDs are
     // reserved for low-level services
-    std::atomic<u32> next_process_id{10};
+    std::atomic<u64> next_process_id{10};
     std::atomic<u32> next_thread_id{1};
 
     // Lists all processes that exist in the current session.
@@ -246,7 +246,7 @@ u32 KernelCore::CreateNewThreadID() {
     return impl->next_thread_id++;
 }
 
-u32 KernelCore::CreateNewProcessID() {
+u64 KernelCore::CreateNewProcessID() {
     return impl->next_process_id++;
 }
 

src/core/hle/kernel/kernel.h

@@ -88,7 +88,7 @@ private:
     u32 CreateNewObjectID();
 
     /// Creates a new process ID, incrementing the internal process ID counter;
-    u32 CreateNewProcessID();
+    u64 CreateNewProcessID();
 
     /// Creates a new thread ID, incrementing the internal thread ID counter.
     u32 CreateNewThreadID();

src/core/hle/kernel/process.h

@@ -162,7 +162,7 @@ public:
     }
 
     /// Gets the unique ID that identifies this particular process.
-    u32 GetProcessID() const {
+    u64 GetProcessID() const {
         return process_id;
     }
 
@@ -288,10 +288,10 @@ private:
     ProcessStatus status;
 
     /// The ID of this process
-    u32 process_id = 0;
+    u64 process_id = 0;
 
     /// Title ID corresponding to the process
-    u64 program_id;
+    u64 program_id = 0;
 
     /// Resource limit descriptor for this process
     SharedPtr<ResourceLimit> resource_limit;