regmap-i2c: add missing MODULE_DESCRIPTION() macro

With ARCH=arm64, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/base/regmap/regmap-i2c.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/base/regmap/regmap-i2c.c

···
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_i2c);
 
+MODULE_DESCRIPTION("Register map access API - I2C support");
 MODULE_LICENSE("GPL");