kernel: add CONFIG_NVMEM_U_BOOT_ENV symbol to configs

This fixes:
  U-Boot environment variables support (NVMEM_U_BOOT_ENV) [N/m/y/?] (NEW)

Fixes: 34cf310435044 ("kernel: backport U-Boot environment data NVMEM driver")
Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/generic/config-5.10

@@ -4240,6 +4240,7 @@ CONFIG_NMI_LOG_BUF_SHIFT=13
 # CONFIG_NVMEM_IMX_OCOTP is not set
 # CONFIG_NVMEM_REBOOT_MODE is not set
 # CONFIG_NVMEM_SYSFS is not set
+# CONFIG_NVMEM_U_BOOT_ENV is not set
 # CONFIG_NVME_FC is not set
 # CONFIG_NVME_TARGET is not set
 # CONFIG_NVME_TCP is not set

target/linux/generic/config-5.15

@@ -4407,6 +4407,7 @@ CONFIG_NMI_LOG_BUF_SHIFT=13
 # CONFIG_NVMEM_REBOOT_MODE is not set
 # CONFIG_NVMEM_RMEM is not set
 # CONFIG_NVMEM_SYSFS is not set
+# CONFIG_NVMEM_U_BOOT_ENV is not set
 # CONFIG_NVME_FC is not set
 # CONFIG_NVME_TARGET is not set
 # CONFIG_NVME_TCP is not set