iio: adc: Kconfig: Make RZG2L_ADC depend on ARCH_RZG2L

ADC block is common on Renesas RZ/G2L and RZ/V2L SoC's, so instead of
adding dependency for each SoC's add dependency on ARCH_RZG2L. The
ARCH_RZG2L config option is already selected by ARCH_R9A07G044 and
ARCH_R9A07G054.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220406070315.13862-1-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/Kconfig

@@ -910,7 +910,7 @@ config ROCKCHIP_SARADC
 
 config RZG2L_ADC
 	tristate "Renesas RZ/G2L ADC driver"
-	depends on ARCH_R9A07G044 || COMPILE_TEST
+	depends on ARCH_RZG2L || COMPILE_TEST
 	help
 	  Say yes here to build support for the ADC found in Renesas
 	  RZ/G2L family.