add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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obj-y                += clk.o
obj-$(CONFIG_LOONGSON1_LS1B)    += clk-loongson1b.o
obj-$(CONFIG_LOONGSON1_LS1C)    += clk-loongson1c.o