tests: spi: update overlay for ek_ra8m1

Add interrupts information for ek_ra8m1 board

Signed-off-by: The Nguyen <the.nguyen.yf@renesas.com>

Author: thenguyenyf

tests/drivers/spi/spi_controller_peripheral/boards/ek_ra8m1.overlay

@@ -47,6 +47,8 @@
 };
 
 dut_spis: &spi1 {
+	interrupts = <92 12>, <93 12>, <94 12>, <95 12>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
 	rx-dtc;
 	tx-dtc;
 	status = "okay";

tests/drivers/spi/spi_loopback/boards/ek_ra8m1.overlay

@@ -18,6 +18,8 @@
 };
 
 &spi0 {
+	interrupts = <92 12>, <93 12>, <94 12>, <95 12>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
 	rx-dtc;
 	tx-dtc;
 	pinctrl-0 = <&spi0_default>;