Optimizations

Removing the ASSERT() makro using assert() instead. assert() is better
controlled with the NDEBUG define.

Using uintptr_t instead of uint32_t * for the NPU base address. This
saves a division by 4 in the register read and write functions.

Change-Id: I65a91fe35dc63666e50bdf7a756ad15b56dc66e9
diff --git a/src/ethosu_driver.c b/src/ethosu_driver.c
index 5910fa4..4c1b100 100644
--- a/src/ethosu_driver.c
+++ b/src/ethosu_driver.c
@@ -229,7 +229,7 @@
 
     // Verify that interrupt has been raised
     (void)ethosu_is_irq_raised(&drv->dev, &irq_raised);
-    ASSERT(irq_raised == 1);
+    assert(irq_raised == 1);
     drv->irq_triggered = true;
 
     // Clear interrupt
@@ -237,7 +237,7 @@
 
     // Verify that interrupt has been successfully cleared
     (void)ethosu_is_irq_raised(&drv->dev, &irq_raised);
-    ASSERT(irq_raised == 0);
+    assert(irq_raised == 0);
 
     if (ethosu_status_has_error(&drv->dev))
     {