config_zhip: remove _CONCAT macro that broke non Chrome SDK builds

Author: TapFW

zephyr/shim/include/config_chip.h

@@ -574,7 +574,7 @@ extern "C" {
 
 #if DT_HAS_CHOSEN(zephyr_flash)
 #define CONFIG_PROGRAM_MEMORY_BASE \
-	_CONCAT(DT_REG_ADDR(DT_CHOSEN(zephyr_flash)), U)
+	DT_REG_ADDR(DT_CHOSEN(zephyr_flash))
 #else
 #error "A zephyr,flash device must be chosen in the device tree"
 #endif