kernel: add missing symbols for v4.14

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/generic/config-4.14

@@ -1187,6 +1187,7 @@ CONFIG_DQL=y
 # CONFIG_DRM_SII902X is not set
 # CONFIG_DRM_SIL_SII8620 is not set
 # CONFIG_DRM_STI is not set
+# CONFIG_DRM_STM is not set
 # CONFIG_DRM_TILCDC is not set
 # CONFIG_DRM_TINYDRM is not set
 # CONFIG_DRM_TI_TFP410 is not set
@@ -4725,6 +4726,7 @@ CONFIG_STRIP_ASM_SYMS=y
 # CONFIG_SURFACE_3_BUTTON is not set
 # CONFIG_SUSPEND is not set
 # CONFIG_SUSPEND_SKIP_SYNC is not set
+# CONFIG_SW_SYNC is not set
 CONFIG_SWAP=y
 # CONFIG_SWCONFIG is not set
 # CONFIG_SWCONFIG_B53 is not set