[nrf fromtree] tests: drivers: spi: spi_loopback: Run test on nrf54h20 PPR XIP

The spi_loopback test requires more RAM than is avilable
on nrf54h20dk/nrf54h20/cpuppr target.

Meanwhile, test fits in Execute In Place (XIP) variant
of the PPR target.

Switch spi_loopback test to nrf54h20 PPR XIP target.

Signed-off-by: Sebastian Głąb <[email protected]>
(cherry picked from commit 6d76a71)

Author: nordic-segl

tests/drivers/spi/spi_loopback/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -7,15 +7,4 @@
 
 &spi130 {
 	memory-regions = <&cpuapp_dma_region>;
-	zephyr,pm-device-runtime-auto;
-	slow@0 {
-		compatible = "test-spi-loopback-slow";
-		reg = <0>;
-		spi-max-frequency = <DT_FREQ_K(500)>;
-	};
-	fast@0 {
-		compatible = "test-spi-loopback-fast";
-		reg = <0>;
-		spi-max-frequency = <DT_FREQ_M(8)>;
-	};
 };

tests/drivers/spi/spi_loopback/boards/nrf54h20dk_nrf54h20_cpuppr.conf

@@ -0,0 +1,2 @@
+CONFIG_SPI_LARGE_BUFFER_SIZE=1024
+CONFIG_SPI_IDEAL_TRANSFER_DURATION_SCALING=15

tests/drivers/spi/spi_loopback/boards/nrf54h20dk_nrf54h20_cpuppr_xip.conf

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024 Nordic Semiconductor ASA
+ * Copyright (c) 2025 Nordic Semiconductor ASA
  *
  * SPDX-License-Identifier: Apache-2.0
  */