dt-bindings: sunxi: Update clock/reset binding headers

Some devicetree updates make use of newly-exposed clocks and resets.
To support that, copy the binding headers from the Linux v5.18-rc1 tag.

Signed-off-by: Samuel Holland <samuel@sholland.org>
diff --git a/include/dt-bindings/clock/sun6i-a31-ccu.h b/include/dt-bindings/clock/sun6i-a31-ccu.h
index c5d1334..39878d9 100644
--- a/include/dt-bindings/clock/sun6i-a31-ccu.h
+++ b/include/dt-bindings/clock/sun6i-a31-ccu.h
@@ -49,6 +49,8 @@
 
 #define CLK_PLL_VIDEO1_2X	13
 
+#define CLK_PLL_MIPI		15
+
 #define CLK_CPU			18
 
 #define CLK_AHB1_MIPIDSI	23