ar71xx: add config ATH79_MACH_TL_WA901ND_V4 for kernel 4.4

This config option was not added in commit r49158.

Signed-off-by: Hauke Mehrtens <[email protected]>

SVN-Revision: 49195

target/linux/ar71xx/config-4.4

@@ -146,6 +146,7 @@ CONFIG_ATH79_MACH_TL_WA801ND_V3=y
 CONFIG_ATH79_MACH_TL_WA830RE_V2=y
 CONFIG_ATH79_MACH_TL_WA901ND=y
 CONFIG_ATH79_MACH_TL_WA901ND_V2=y
+CONFIG_ATH79_MACH_TL_WA901ND_V4=y
 CONFIG_ATH79_MACH_TL_WAX50RE=y
 CONFIG_ATH79_MACH_TL_WDR3320_V2=y
 CONFIG_ATH79_MACH_TL_WDR3500=y