add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mailbox/Makefile
..
..
@@ -19,6 +19,8 @@
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 obj-$(CONFIG_ROCKCHIP_MBOX)	+= rockchip-mailbox.o
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+obj-$(CONFIG_ROCKCHIP_MBOX_DEMO)	+= rockchip-mbox-demo.o
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+
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 obj-$(CONFIG_PCC)		+= pcc.o
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 obj-$(CONFIG_ALTERA_MBOX)	+= mailbox-altera.o