generic: add missing config symbol

Signed-off-by: David Bauer <[email protected]>

target/linux/generic/config-5.4

@@ -4314,6 +4314,7 @@ CONFIG_RCU_TORTURE_TEST_SLOW_INIT_DELAY=3
 # CONFIG_REGULATOR_LTC3589 is not set
 # CONFIG_REGULATOR_LTC3676 is not set
 # CONFIG_REGULATOR_MAX1586 is not set
+# CONFIG_REGULATOR_MAX77620 is not set
 # CONFIG_REGULATOR_MAX8649 is not set
 # CONFIG_REGULATOR_MAX8660 is not set
 # CONFIG_REGULATOR_MAX8952 is not set