nvmem: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/nvmem/nvmem-apple-efuses.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/nvmem/nvmem_brcm_nvram.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/nvmem/nvmem_u-boot-env.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240705074852.423202-2-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/apple-efuses.c

@@ -78,4 +78,5 @@ static struct platform_driver apple_efuses_driver = {
 module_platform_driver(apple_efuses_driver);
 
 MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>");
+MODULE_DESCRIPTION("Apple SoC eFuse driver");
 MODULE_LICENSE("GPL");

drivers/nvmem/brcm_nvram.c

@@ -253,5 +253,6 @@ static int __init brcm_nvram_init(void)
 subsys_initcall_sync(brcm_nvram_init);
 
 MODULE_AUTHOR("Rafał Miłecki");
+MODULE_DESCRIPTION("Broadcom I/O-mapped NVRAM support driver");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);

drivers/nvmem/u-boot-env.c

@@ -249,5 +249,6 @@ static struct platform_driver u_boot_env_driver = {
 module_platform_driver(u_boot_env_driver);
 
 MODULE_AUTHOR("Rafał Miłecki");
+MODULE_DESCRIPTION("U-Boot environment variables support module");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(of, u_boot_env_of_match_table);