[nrf fromtree] drivers: adc: nrfx_saadc: use CONFIG_NRF_PLATFORM_HALTIUM

So that any Haltium based SoC uses the same settings, including nRF54H20
EngB.

Signed-off-by: Gerard Marull-Paretas <[email protected]>
(cherry picked from commit 5a4655f)

Author: gmarull

drivers/adc/adc_nrfx_saadc.c

@@ -19,7 +19,7 @@ LOG_MODULE_REGISTER(adc_nrfx_saadc);
 
 #if (NRF_SAADC_HAS_AIN_AS_PIN)
 
-#if defined(CONFIG_SOC_NRF54H20) || defined(CONFIG_SOC_NRF9280)
+#if defined(CONFIG_NRF_PLATFORM_HALTIUM)
 static const uint8_t saadc_psels[NRF_SAADC_AIN7 + 1] = {
 	[NRF_SAADC_AIN0] = NRF_PIN_PORT_TO_PIN_NUMBER(0U, 1),
 	[NRF_SAADC_AIN1] = NRF_PIN_PORT_TO_PIN_NUMBER(1U, 1),