boards/qemu_x86: fix emulated program memory size

Qemu_x86 didn't reflect emulated program memory size.
It was because chosen zephyr,flash was assigned to flash_simulator
which was helping to generate DT_FLASH properties for sim_flash node.

This change revert choice of flash0 which solve problem with
program memory size. Flash simulator have to use
DT_SOC_NV_FLASH_xxx labels for fetch its property since that.

fixes #15832

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

boards/x86/qemu_x86/dts_fixup.h

@@ -9,4 +9,9 @@
 
 #define DT_FLASH_DEV_NAME	DT_ZEPHYR_SIM_FLASH_SIM_FLASH_LABEL
 
+#define DT_FLASH_SIM_BASE_ADDRESS	DT_SOC_NV_FLASH_0_BASE_ADDRESS
+#define DT_FLASH_SIM_ERASE_BLOCK_SIZE	DT_SOC_NV_FLASH_0_ERASE_BLOCK_SIZE
+#define DT_FLASH_SIM_SIZE		DT_SOC_NV_FLASH_0_SIZE
+#define DT_FLASH_SIM_WRITE_BLOCK_SIZE	DT_SOC_NV_FLASH_0_WRITE_BLOCK_SIZE
+
 /* End of Board Level DTS fixup file */

boards/x86/qemu_x86/qemu_x86.dts

@@ -20,7 +20,7 @@
 
 	chosen {
 		zephyr,sram = &sram0;
-		zephyr,flash = &flash_sim0;
+		zephyr,flash = &flash0;
 		zephyr,console = &uart0;
 		zephyr,shell-uart = &uart0;
 		zephyr,bt-uart = &uart1;