bcm4908: enable NVMEM U-Boot env data driver

It's needed for devices with U-Boot bootloader.

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/bcm4908/config-5.10

@@ -160,6 +160,9 @@ CONFIG_NET_FLOW_LIMIT=y
 CONFIG_NET_SWITCHDEV=y
 CONFIG_NO_IOPORT_MAP=y
 CONFIG_NR_CPUS=4
+CONFIG_NVMEM=y
+CONFIG_NVMEM_SYSFS=y
+CONFIG_NVMEM_U_BOOT_ENV=y
 CONFIG_OF=y
 CONFIG_OF_ADDRESS=y
 CONFIG_OF_EARLY_FLATTREE=y