enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/drivers/staging/mt7621-pinctrl/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0
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 obj-$(CONFIG_PINCTRL_RT2880)   += pinctrl-rt2880.o
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 ccflags-y += -I$(srctree)/drivers/pinctrl