Add the PPC platform

Tested on a Mac Mini G4 running Ubuntu 16.04.4 LTS, kernel version 4.4.0-119-powerpc-smp

Makefile

@@ -84,6 +84,7 @@ CONFIG_PLATFORM_ARM_SUNxI = n
 CONFIG_PLATFORM_ARM_SUN6I = n
 CONFIG_PLATFORM_ACTIONS_ATM702X = n
 CONFIG_PLATFORM_ACTIONS_ATV5201 = n
+CONFIG_PLATFORM_PPC = n
 
 CONFIG_DRVEXT_MODULE = n
 
@@ -971,6 +972,17 @@ KVER := $(KERNEL_VER)
 KSRC:= $(CFGDIR)/../../kernel/linux-$(KERNEL_VER)
 endif
 
+ifeq ($(CONFIG_PLATFORM_PPC), y)
+EXTRA_CFLAGS += -DCONFIG_BIG_ENDIAN
+SUBARCH := $(shell uname -m | sed -e s/ppc/powerpc/)
+ARCH ?= $(SUBARCH)
+CROSS_COMPILE ?=
+KVER ?= $(shell uname -r)
+KSRC := /lib/modules/$(KVER)/build
+MODDESTDIR := /lib/modules/$(KVER)/kernel/drivers/net/wireless/
+INSTALL_PREFIX :=
+endif
+
 
 ifeq ($(CONFIG_MULTIDRV), y)