Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
index 3ddea96..1dd1540 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
@@ -512,7 +512,7 @@
 /**
  * mpc52xx_get_irq - Get pending interrupt number hook function
  *
- * Called by the interupt handler to determine what IRQ handler needs to be
+ * Called by the interrupt handler to determine what IRQ handler needs to be
  * executed.
  *
  * Status of pending interrupts is determined by reading the encoded status