mfd: twl: Select MFD_CORE

Fix link error:
ld.bfd: drivers/mfd/twl-core.o: in function `twl_probe':
git/drivers/mfd/twl-core.c:846: undefined reference to `devm_mfd_add_devices'

Cc:  <stable@vger.kernel.org>
Fixes: 63416320 ("mfd: twl-core: Add a clock subdevice for the TWL6032")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Andreas Kemnade <andreas@kemnade.info>
Link: https://lore.kernel.org/r/20240221143021.3542736-1-alexander.sverdlin@siemens.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/Kconfig

@@ -1773,6 +1773,7 @@ config TWL4030_CORE
 	bool "TI TWL4030/TWL5030/TWL6030/TPS659x0 Support"
 	depends on I2C=y
 	select IRQ_DOMAIN
+	select MFD_CORE
 	select REGMAP_I2C
 	help
 	  Say yes here if you have TWL4030 / TWL6030 family chip on your board.