Bugfix - legacy kernels doesn't want to play nice with kernel options

When NFSD is enabled as module, kernel does not compile. But it works as build in. Since its pretty pointless to fix in the code, lets use this workaround.

FYI @patrickbkr

config/kernel/linux-sun50iw9-legacy.config

@@ -4254,13 +4254,9 @@ CONFIG_PNFS_FLEXFILE_LAYOUT=m
 CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN="kernel.org"
 CONFIG_NFS_V4_1_MIGRATION=y
 CONFIG_NFS_V4_SECURITY_LABEL=y
-CONFIG_NFS_FSCACHE=y
 # CONFIG_NFS_USE_LEGACY_DNS is not set
 CONFIG_NFS_USE_KERNEL_DNS=y
-CONFIG_NFS_DEBUG=y
-CONFIG_NFS_DISABLE_UDP_SUPPORT=y
-# CONFIG_NFS_V4_2_READ_PLUS is not set
-CONFIG_NFSD=m
+CONFIG_NFSD=y
 CONFIG_NFSD_V2_ACL=y
 CONFIG_NFSD_V3=y
 CONFIG_NFSD_V3_ACL=y
@@ -4269,16 +4265,17 @@ CONFIG_NFSD_PNFS=y
 CONFIG_NFSD_BLOCKLAYOUT=y
 CONFIG_NFSD_SCSILAYOUT=y
 CONFIG_NFSD_FLEXFILELAYOUT=y
-# CONFIG_NFSD_V4_2_INTER_SSC is not set
 CONFIG_NFSD_V4_SECURITY_LABEL=y
-CONFIG_GRACE_PERIOD=y
-CONFIG_LOCKD=y
+CONFIG_NFSD_FAULT_INJECTION=y
+CONFIG_GRACE_PERIOD=m
+CONFIG_LOCKD=m
 CONFIG_LOCKD_V4=y
-CONFIG_NFS_ACL_SUPPORT=y
+CONFIG_NFS_ACL_SUPPORT=m
 CONFIG_NFS_COMMON=y
-CONFIG_SUNRPC=y
-CONFIG_SUNRPC_GSS=y
+CONFIG_SUNRPC=m
+CONFIG_SUNRPC_GSS=m
 CONFIG_SUNRPC_BACKCHANNEL=y
+CONFIG_SUNRPC_SWAP=y
 CONFIG_RPCSEC_GSS_KRB5=m
 # CONFIG_SUNRPC_DEBUG is not set
 CONFIG_CEPH_FS=m
@@ -4793,7 +4790,7 @@ CONFIG_CLZ_TAB=y
 # CONFIG_IRQ_POLL is not set
 CONFIG_MPILIB=y
 CONFIG_LIBFDT=y
-CONFIG_OID_REGISTRY=y
+CONFIG_OID_REGISTRY=m
 CONFIG_FONT_SUPPORT=y
 # CONFIG_FONTS is not set
 CONFIG_FONT_8x8=y