gpio: mpc8xxx: Rename Kconfig option, structures, and functions

Rename the Kconfig option, structures (and their members), as well as
functions of the mpc85xx driver to include mpc8xxx to reflect the more
generic usage.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b4e859e..b121979 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -276,11 +276,11 @@
 	  Now, max 24 bits chips and PCA953X compatible chips are
 	  supported
 
-config MPC85XX_GPIO
-	bool "Freescale MPC85XX GPIO driver"
+config MPC8XXX_GPIO
+	bool "Freescale MPC8XXX GPIO driver"
 	depends on DM_GPIO
 	help
-	  This driver supports the built-in GPIO controller of MPC85XX CPUs.
+	  This driver supports the built-in GPIO controller of MPC8XXX CPUs.
 	  Each GPIO bank is identified by its own entry in the device tree,
 	  i.e.
 
@@ -298,7 +298,4 @@
 	  Aside from the standard functions of input/output mode, and output
 	  value setting, the open-drain feature, which can configure individual
 	  GPIOs to work as open-drain outputs, is supported.
-
-	  The driver has been tested on MPC85XX, but it is likely that other
-	  PowerQUICC III devices will work as well.
 endmenu