dt-bindings: clock: mvebu: Add compatible string for 98dx1135 core clock

Add compatible string for the core clock on the 98dx1135 switch with
integrated CPU.

Signed-off-by: Chris Packham <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/mvebu-core-clock.txt

···
 	"marvell,dove-core-clock" - for Dove SoC core clocks
 	"marvell,kirkwood-core-clock" - for Kirkwood SoC (except mv88f6180)
 	"marvell,mv88f6180-core-clock" - for Kirkwood MV88f6180 SoC
+	"marvell,mv98dx1135-core-clock" - for Kirkwood 98dx1135 SoC
 	"marvell,mv88f5181-core-clock" - for Orion MV88F5181 SoC
 	"marvell,mv88f5182-core-clock" - for Orion MV88F5182 SoC
 	"marvell,mv88f5281-core-clock" - for Orion MV88F5281 SoC