linux-headers: bump 4.7.x series to 4.7.4

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-headers/Config.in.host

@@ -243,5 +243,5 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "4.4.19"	if BR2_KERNEL_HEADERS_4_4
 	default "4.5.7"		if BR2_KERNEL_HEADERS_4_5
 	default "4.6.7"		if BR2_KERNEL_HEADERS_4_6
-	default "4.7.3"		if BR2_KERNEL_HEADERS_4_7
+	default "4.7.4"		if BR2_KERNEL_HEADERS_4_7
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION