[openwrt/openwrt] ath79: add missing kernel config symbol

[LEDE Commits]

stintel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/f4473baf6e24060ef111f97a71419ab5f813e5ca

commit f4473baf6e24060ef111f97a71419ab5f813e5ca
Author: Stijn Tintel <stijn at linux-ipv6.be>
AuthorDate: Sat Apr 24 15:54:24 2021 +0300

    ath79: add missing kernel config symbol
    
    Commit f724a583dcf7 updated the nand-rb4xx driver to the 5.10 testing
    kernel, but forgot to add the new kernel config symbol it introduces to
    the 5.10 config.
    
    Fixes: f724a583dcf7 ("ath79: mikrotik: update nand-rb4xx driver")
    Reported-by: Russell Senior <russell at personaltelco.net>
    Signed-off-by: Stijn Tintel <stijn at linux-ipv6.be>
---
 target/linux/ath79/config-5.10 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/ath79/config-5.10 b/target/linux/ath79/config-5.10
index 9aa320dcda..d4abddb445 100644
--- a/target/linux/ath79/config-5.10
+++ b/target/linux/ath79/config-5.10
@@ -96,6 +96,7 @@ CONFIG_MDIO_BUS=y
 CONFIG_MDIO_DEVICE=y
 CONFIG_MDIO_GPIO=y
 CONFIG_MEMFD_CREATE=y
+# CONFIG_MFD_RB4XX_CPLD is not set
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
 CONFIG_MIPS=y