MAINTAINERS: Add entry for BM1880 SoC clock driver

Add MAINTAINERS entry for Bitmain BM1880 SoC clock driver.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lkml.kernel.org/r/20191115162901.17456-8-manivannan.sadhasivam@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

MAINTAINERS

@@ -1529,8 +1529,10 @@ M:	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm64/boot/dts/bitmain/
+F:	drivers/clk/clk-bm1880.c
 F:	drivers/pinctrl/pinctrl-bm1880.c
 F:	Documentation/devicetree/bindings/arm/bitmain.yaml
+F:	Documentation/devicetree/bindings/clock/bitmain,bm1880-clk.yaml
 F:	Documentation/devicetree/bindings/pinctrl/bitmain,bm1880-pinctrl.txt
 
 ARM/CALXEDA HIGHBANK ARCHITECTURE