Sprinkle `const` around where appropriate (#1909)

* Sprinkle `const` around where appropriate

- This will make it easier to use `NDS` objects in `const` contexts (e.g. `const` parameters or methods)

* Remove the `const` qualifier on `DSi_DSP::DSPRead16`

- MMIO reads can be non-pure, so this may not be `const` in the future

1 files changed, 2 insertions, 2 deletions

diff --git a/src/DSi_NDMA.h b/src/DSi_NDMA.h
index 7e87da7..fb34dbd 100644
--- a/src/DSi_NDMA.h
+++ b/src/DSi_NDMA.h
@@ -44,12 +44,12 @@ public:
     void Run9();
     void Run7();
 
-    bool IsInMode(u32 mode)
+    bool IsInMode(u32 mode) const
     {
         return ((mode == StartMode) && (Cnt & 0x80000000));
     }
 
-    bool IsRunning() { return Running!=0; }
+    bool IsRunning() const { return Running!=0; }
 
     void StartIfNeeded(u32 mode)
     {