ARM: shmobile: r8a7791: add MLB+ clock

Add MLB+ clock to R8A7791 device tree.

Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
[Sergei: rebased, renamed, added changelog]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/include/dt-bindings/clock/r8a7791-clock.h b/include/dt-bindings/clock/r8a7791-clock.h
index ee9bb944..f096f3f 100644
--- a/include/dt-bindings/clock/r8a7791-clock.h
+++ b/include/dt-bindings/clock/r8a7791-clock.h
@@ -92,6 +92,7 @@
 
 /* MSTP8 */
 #define R8A7791_CLK_IPMMU_SGX		0
+#define R8A7791_CLK_MLB			2
 #define R8A7791_CLK_VIN2		9
 #define R8A7791_CLK_VIN1		10
 #define R8A7791_CLK_VIN0		11