kernel-headers: bump 2.6.26 and 2.6.27 minor versions

toolchain/kernel-headers/Config.in

@@ -113,7 +113,7 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "2.6.23"	if BR2_KERNEL_HEADERS_2_6_23
 	default "2.6.24.7"	if BR2_KERNEL_HEADERS_2_6_24
 	default "2.6.25.19"	if BR2_KERNEL_HEADERS_2_6_25
-	default "2.6.26.6"	if BR2_KERNEL_HEADERS_2_6_26
-	default "2.6.27.3"	if BR2_KERNEL_HEADERS_2_6_27
+	default "2.6.26.7"	if BR2_KERNEL_HEADERS_2_6_26
+	default "2.6.27.4"	if BR2_KERNEL_HEADERS_2_6_27
 	default "2.6"		if BR2_KERNEL_HEADERS_SNAP