drivers/kw41zrf: Transceiver driver for the KW41Z radio

This is the radio found in NXP Kinetis KW41Z, KW21Z. Only 802.15.4 mode
is implemented (KW41Z also supports BLE on the same transceiver).

The driver uses vendor supplied initialization code for the low level
XCVR hardware, these files were imported from Kinetis Connectivity
Software version 1.0.2 (framework_5.3.2)

boards/frdm-kw41z/Makefile.dep

@@ -5,3 +5,7 @@ ifneq (,$(filter saul_default,$(USEMODULE)))
 #   USEMODULE += saul_gpio
   USEMODULE += saul_adc
 endif
+
+ifneq (,$(filter netdev_default gnrc_netdev_default,$(USEMODULE)))
+  USEMODULE += kw41zrf
+endif

cpu/kw41z/Makefile

@@ -1,8 +1,9 @@
 # define the module that is build
 MODULE = cpu
 
-# add a list of subdirectories, that should also be build
-DIRS = periph $(RIOTCPU)/cortexm_common $(KINETIS_COMMON)
+# add a list of directories that should also be built
+DIRS += periph $(RIOTCPU)/cortexm_common $(KINETIS_COMMON)
+DIRS += vendor/XCVR/MKW41Z4
 
 # (file triggers compiler bug. see #5775)
 SRC_NOLTO += vectors.c

cpu/kw41z/Makefile.include

@@ -21,4 +21,11 @@ export COMMON_STARTUP = $(KINETIS_COMMON)
 # add the CPU specific system calls implementations for the linker
 export UNDEF += $(BINDIR)/cpu/vectors.o
 
+# Vendor supplied transceiver driver
+export INCLUDES += -I$(RIOTCPU)/$(CPU)/vendor/Common
+export INCLUDES += -I$(RIOTCPU)/$(CPU)/vendor/OSAbstraction/Interface
+export INCLUDES += -I$(RIOTCPU)/$(CPU)/vendor/XCVR/MKW41Z4
+
+export USEMODULE += mcux_xcvr
+
 include $(RIOTMAKE)/arch/cortexm.inc.mk