nvmem: update Kconfig description

nvmem can't be built as module anymore, update its Kconfig description.

Fixes: 2a37ce2 ("nvmem: disallow modular CONFIG_NVMEM")
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-13-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/Kconfig

@@ -7,9 +7,6 @@ menuconfig NVMEM
 	  This framework is designed to provide a generic interface to NVMEM
 	  from both the Linux Kernel and the userspace.
 
-	  This driver can also be built as a module. If so, the module
-	  will be called nvmem_core.
-
 	  If unsure, say no.
 
 if NVMEM