Added raspberry x64 arch

Tested and working for my Raspberry Pi 4B

Need to share this now

Makefile

@@ -61,6 +61,7 @@ CONFIG_PLATFORM_ARM_S3C2K4 = n
 CONFIG_PLATFORM_ARM_PXA2XX = n
 CONFIG_PLATFORM_ARM_S3C6K4 = n
 CONFIG_PLATFORM_ARM_RPI = n
+CONFIG_PLATFORM_ARM_RPI_64 = n
 CONFIG_PLATFORM_MIPS_RMI = n
 CONFIG_PLATFORM_RTD2880B = n
 CONFIG_PLATFORM_MIPS_AR9132 = n
@@ -746,6 +747,15 @@ KSRC ?= /lib/modules/$(KVER)/build
 MODDESTDIR := /lib/modules/$(KVER)/kernel/drivers/net/wireless/
 endif
 
+ifeq ($(CONFIG_PLATFORM_ARM_RPI_64), y)
+EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN
+ARCH := arm64
+CROSS_COMPILE := 
+KVER ?= $(shell uname -r)
+KSRC ?= /lib/modules/$(KVER)/build
+MODDESTDIR := /lib/modules/$(KVER)/kernel/drivers/net/wireless/
+endif
+
 ifeq ($(CONFIG_PLATFORM_RTD2880B), y)
 EXTRA_CFLAGS += -DCONFIG_BIG_ENDIAN -DCONFIG_PLATFORM_RTD2880B
 ARCH:=