clk: mpc83xx: Fix typo in "Coherent System Bus"

Cosmetic change.

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
diff --git a/drivers/clk/mpc83xx_clk.h b/drivers/clk/mpc83xx_clk.h
index c06a51e..6b74fc5 100644
--- a/drivers/clk/mpc83xx_clk.h
+++ b/drivers/clk/mpc83xx_clk.h
@@ -321,7 +321,7 @@
 }
 
 /**
- * get_csb_clk() - Read the CSB (Coheren System Bus) clock speed
+ * get_csb_clk() - Read the CSB (Coherent System Bus) clock speed
  * @im: Pointer to the MPC83xx main register map in question
  *
  * Return: The CSB clock speed value as a 32-bit number.