leds: qcom-lpg: Add QCOM_PBS dependency

The lpg driver fails to link now when the pbs driver is in a loadable module:

x86_64-linux-ld: drivers/leds/rgb/leds-qcom-lpg.o: in function `lpg_brightness_set':
leds-qcom-lpg.c:(.text+0xe7f): undefined reference to `qcom_pbs_trigger_event'
x86_64-linux-ld: drivers/leds/rgb/leds-qcom-lpg.o: in function `lpg_probe':
leds-qcom-lpg.c:(.text+0x16a5): undefined reference to `get_pbs_client_device'

Add a dependency to avoid the broken configuration. Apparently there is still
a use for lpg with pbs disabled entirely for certain chips, so allow both
but not LEDS_QCOM_LPG=y with QCOM_PBS=m.

Fixes: 2141101 ("leds: rgb: leds-qcom-lpg: Add support for PPG through single SDAM")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Jean Delvare <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: arndb

drivers/leds/rgb/Kconfig

@@ -41,6 +41,7 @@ config LEDS_QCOM_LPG
 	tristate "LED support for Qualcomm LPG"
 	depends on OF
 	depends on PWM
+	depends on QCOM_PBS || !QCOM_PBS
 	depends on SPMI
 	help
 	  This option enables support for the Light Pulse Generator found in a