clk: Add MPC83xx clock driver

Add a clock driver for the MPC83xx architecture.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/MAINTAINERS b/MAINTAINERS
index e2ab713..1aab4b3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -523,6 +523,9 @@
 F:	include/dt-bindings/memory/mpc83xx-sdram.h
 F:	drivers/sysreset/sysreset_mpc83xx.c
 F:	drivers/sysreset/sysreset_mpc83xx.h
+F:	drivers/clk/mpc83xx_clk.c
+F:	drivers/clk/mpc83xx_clk.h
+F:	include/dt-bindings/clk/mpc83xx-clk.h
 F:	arch/powerpc/cpu/mpc83xx/
 F:	arch/powerpc/include/asm/arch-mpc83xx/