soc: reapply soc mpu code for 20829 platform

	- mpu code in soc.c for 20829 platform was accidentally removed
	  in a recent PR. This is its reapplication

Signed-off-by: McAtee Maxwell <[email protected]>

Author: mcatee-infineon

soc/infineon/cat1b/cyw20829/soc.c

@@ -54,8 +54,43 @@ cy_en_sysint_status_t Cy_SysInt_Init(const cy_stc_sysint_t *config, cy_israddres
 	return(status);
 }
 
+/*
+ * This function will allow execute from sram region.  This is needed only for
+ * this sample because by default all soc will disable the execute from SRAM.
+ * An application that requires that the code be executed from SRAM will have
+ * to configure the region appropriately in arm_mpu_regions.c.
+ */
+#ifdef CONFIG_ARM_MPU
+#include <cmsis_core.h>
+void disable_mpu_rasr_xn(void)
+{
+	uint32_t index;
+
+	/*
+	 * Kept the max index as 8(irrespective of soc) because the sram would
+	 * most likely be set at index 2.
+	 */
+	for (index = 0U; index < 8; index++) {
+		MPU->RNR = index;
+#if defined(CONFIG_ARMV8_M_BASELINE) || defined(CONFIG_ARMV8_M_MAINLINE)
+		if (MPU->RBAR & MPU_RBAR_XN_Msk) {
+			MPU->RBAR ^= MPU_RBAR_XN_Msk;
+		}
+#else
+		if (MPU->RASR & MPU_RASR_XN_Msk) {
+			MPU->RASR ^= MPU_RASR_XN_Msk;
+		}
+#endif /* CONFIG_ARMV8_M_BASELINE || CONFIG_ARMV8_M_MAINLINE */
+	}
+}
+#endif /* CONFIG_ARM_MPU */
+
 void soc_early_init_hook(void)
 {
+#ifdef CONFIG_ARM_MPU
+	disable_mpu_rasr_xn();
+#endif /* CONFIG_ARM_MPU */
+
 	/* Initializes the system */
 	SystemInit();