kernel: add missing config options for layerscape target

This fixes some problems found by build bot.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/config-4.9

@@ -1883,6 +1883,7 @@ CONFIG_IO_STRICT_DEVMEM=y
 # CONFIG_IP6_NF_MATCH_RT is not set
 # CONFIG_IP6_NF_NAT is not set
 # CONFIG_IP6_NF_RAW is not set
+# CONFIG_IP6_NF_SECURITY is not set
 # CONFIG_IP6_NF_TARGET_HL is not set
 # CONFIG_IP6_NF_TARGET_REJECT is not set
 # CONFIG_IP6_NF_TARGET_SYNPROXY is not set
@@ -2948,6 +2949,8 @@ CONFIG_NFS_V3=y
 # CONFIG_NFS_V4 is not set
 # CONFIG_NFS_V4_1 is not set
 # CONFIG_NFTL is not set
+# CONFIG_NFT_BRIDGE_META is not set
+# CONFIG_NFT_BRIDGE_REJECT is not set
 # CONFIG_NFT_DUP_IPV4 is not set
 # CONFIG_NFT_DUP_IPV6 is not set
 # CONFIG_NF_CONNTRACK is not set
@@ -4066,6 +4069,7 @@ CONFIG_SND_DRIVERS=y
 # CONFIG_SND_DUMMY is not set
 # CONFIG_SND_DYNAMIC_MINORS is not set
 # CONFIG_SND_ECHO3G is not set
+# CONFIG_SND_EDMA_SOC is not set
 # CONFIG_SND_EMU10K1 is not set
 # CONFIG_SND_EMU10K1X is not set
 # CONFIG_SND_EMU10K1_SEQ is not set
@@ -4735,6 +4739,7 @@ CONFIG_USB_DEFAULT_PERSIST=y
 # CONFIG_USB_EG20T is not set
 # CONFIG_USB_EHCI_ATH79 is not set
 # CONFIG_USB_EHCI_HCD_AT91 is not set
+# CONFIG_USB_EHCI_HCD_OMAP is not set
 # CONFIG_USB_EHCI_HCD_PPC_OF is not set
 # CONFIG_USB_EHCI_MSM is not set
 # CONFIG_USB_EHCI_MV is not set