power: supply: rt5033_charger: recognize EXTCON setting

CHARGER_RT5033 should honor the EXTCON setting to prevent these
build errors:

riscv64-linux-ld: drivers/power/supply/rt5033_charger.o: in function `.L33':
rt5033_charger.c:(.text.rt5033_charger_probe+0x578): undefined reference to `extcon_find_edev_by_node'
riscv64-linux-ld: drivers/power/supply/rt5033_charger.o: in function `.L0 ':
rt5033_charger.c:(.text.rt5033_charger_probe+0x64e): undefined reference to `devm_extcon_register_notifier_all'
riscv64-linux-ld: drivers/power/supply/rt5033_charger.o: in function `.L96':
rt5033_charger.c:(.text.rt5033_charger_extcon_work+0x32): undefined reference to `extcon_get_state'

Fixes: 12cc585 ("power: supply: rt5033_charger: Add cable detection and USB OTG supply")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Jakob Hauser <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sebastian Reichel <[email protected]>

Author: rddunlap

drivers/power/supply/Kconfig

@@ -769,6 +769,7 @@ config BATTERY_RT5033
 config CHARGER_RT5033
 	tristate "RT5033 battery charger support"
 	depends on MFD_RT5033
+	depends on EXTCON || !EXTCON
 	help
 	  This adds support for battery charger in Richtek RT5033 PMIC.
 	  The device supports pre-charge mode, fast charge mode and