extcon: max14526: depends on I2C to prevent build warning/errors

Make EXTCON_MAX14526 depend on I2C to address a kconfig warning and
subsequent build errors:

WARNING: unmet direct dependencies detected for REGMAP_I2C
Depends on [m]: I2C [=m]
Selected by [y]:
- EXTCON_MAX14526 [=y] && EXTCON [=y]

ld: vmlinux.o: in function `max14526_driver_init':
extcon-max14526.c:(.init.text+0x77b0e): undefined reference to `i2c_register_driver'
ld: vmlinux.o: in function `max14526_driver_exit':
extcon-max14526.c:(.exit.text+0x467c): undefined reference to `i2c_del_driver'

Fixes: 145af3ddd1cd ("extcon: Add basic support for Maxim MAX14526 MUIC")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://lore.kernel.org/lkml/20250515234803.1385375-1-rdunlap@infradead.org/