Building driver for raspberry

Hello, i am trying to build the driver on a raspberry 3 b +.

root@pi-raspberry4:~/mt76# uname -a
Linux pi-raspberry4 4.4.38-v7+ #938 SMP Thu Dec 15 15:22:21 GMT 2016 armv7l armv7l armv7l G

When running make this error shows:

/var/lib/dkms/mt76/1/build/util.h:12:28: fatal error: linux/bitfield.h: No such file or directory
 #include <linux/bitfield.h>

And my makefile is

# SPDX-License-Identifier: GPL-2.0-only
EXTRA_CFLAGS += -Werror -DCONFIG_MT76_LEDS
obj-m := mt76.o
obj-$(CONFIG_MT76_USB) += mt76-usb.o
obj-$(CONFIG_MT76_SDIO) += mt76-sdio.o
obj-$(CONFIG_MT76x02_LIB) += mt76x02-lib.o
obj-$(CONFIG_MT76x02_USB) += mt76x02-usb.o

mt76-y := \
	mmio.o util.o trace.o dma.o mac80211.o debugfs.o eeprom.o \
	tx.o agg-rx.o mcu.o

mt76-$(CONFIG_PCI) += pci.o
mt76-$(CONFIG_NL80211_TESTMODE) += testmode.o

mt76-usb-y := usb.o usb_trace.o
mt76-sdio-y := sdio.o

CFLAGS_trace.o := -I$(src)
CFLAGS_usb_trace.o := -I$(src)
CFLAGS_mt76x02_trace.o := -I$(src)

mt76x02-lib-y := mt76x02_util.o mt76x02_mac.o mt76x02_mcu.o \
		 mt76x02_eeprom.o mt76x02_phy.o mt76x02_mmio.o \
		 mt76x02_txrx.o mt76x02_trace.o mt76x02_debugfs.o \
		 mt76x02_dfs.o mt76x02_beacon.o

mt76x02-usb-y := mt76x02_usb_mcu.o mt76x02_usb_core.o

obj-$(CONFIG_MT76x0_COMMON) += mt76x0/
obj-$(CONFIG_MT76x2_COMMON) += mt76x2/
obj-$(CONFIG_MT7603E) += mt7603/
obj-$(CONFIG_MT7615_COMMON) += mt7615/
obj-$(CONFIG_MT7915E) += mt7915/

I read a related issue about this matter, but someone mentioned that the solution is to backport lede mac80211 to openwrt which I don't understand and I'm not running openwrt.

Any help would be greatly appreciated.

Start with the Makefile and util.h, then inspect the Raspberry Pi kernel headers for the reported 4.4.38-v7+ environment and the missing linux/bitfield.h file. Reproduce the make failure and determine whether the driver can build against that kernel; done means a documented, reproducible build result or a clearly identified compatibility boundary.