Remove AVR32 patches from kernel-headers directory and put them in

"target/device/Atmel/arch-avre/kernel-headers-2.6.28.2"

Make sure BR2_KERNEL_HEADERS_PATCH_DIR is enabled for 2.6.28
Set
KERNEL_HEADERS_PATCH_DIR="target/device/Atmel/arch-avre/kernel-headers-2.6.28.2"
for Atmel AVR32 targets and "valka"

target/device/Atmel/Makefile.in

@@ -13,6 +13,10 @@ TARGET_SKELETON:=$(ATMEL_TARGET)/target_skeleton
 TARGET_DEVICE_TABLE:=$(ATMEL_TARGET)/device_table.txt
 TARGET_SKELETON_LINKS:=$(ATMEL_TARGET)/skel.tar.gz
 
+ifeq ($(BR2_avr32),y)
+KERNEL_HEADERS_PATCH_DIR=target/device/Atmel/arch-avr32/kernel-headers-2.6.28.2
+endif
+
 ifneq ($(COPYTO),)
 TARGET_ATMEL_COPYTO:=$(strip $(subst ",, $(BR2_COPYTO)))
 else

target/device/valka/Makefile.in

@@ -3,6 +3,7 @@ VALKA_PATH= target/device/valka
 
 TARGET_SKELETON=$(VALKA_PATH)/target_skeleton
 TARGET_DEVICE_TABLE=$(VALKA_PATH)/device_table.txt
+KERNEL_HEADERS_PATCH_DIR=target/device/Atmel/arch-avr32/kernel-headers-2.6.28.2
 
 valka_status:
 	@echo "***************************************************************"

toolchain/kernel-headers/Config.in

@@ -98,7 +98,7 @@ config BR2_KERNEL_HEADERS_RT
 
 config BR2_KERNEL_HEADERS_PATCH_DIR
 	bool "Add additional headers from $(KERNEL_HEADERS_PATCH_DIR)"
-	depends on BR2_KERNEL_HEADERS_2_6_20_4 || BR2_KERNEL_HEADERS_2_6_21_5 || BR2_KERNEL_HEADERS_2_6_22_1  || BR2_KERNEL_HEADERS_2_6_22_10
+	depends on BR2_KERNEL_HEADERS_2_6_20_4 || BR2_KERNEL_HEADERS_2_6_21_5 || BR2_KERNEL_HEADERS_2_6_22_1  || BR2_KERNEL_HEADERS_2_6_22_10 || BR2_KERNEL_HEADERS_2_6_28
 	help
 	  Apply additional kernel patches defined by KERNEL_HEADERS_PATCH_DIR
 	  in your board directory.