lk2nd: dev_tree: Do not update Android fstab by default

For Linux OS, this has no use.

For custom Android OS, the developers are used to make changes
on the source files directly, rather than relying on this logic.

Additionally, the changes that it make are most likely deprecated
on newer Android versions or newer kernel versions.

Stock Android OS may rely on it though, but the purpose of lk2nd
is likely never used to be booting stock Android OS...

Author: me-cafebabe

makefile

@@ -134,6 +134,10 @@ ifeq ($(DYNAMIC_PARTITION_SUPPORT),1)
   DEFINES += DYNAMIC_PARTITION_SUPPORT=1
 endif
 
+ifeq ($(UPDATE_ANDROID_FSTAB),1)
+  DEFINES += UPDATE_ANDROID_FSTAB=1
+endif
+
 ifeq ($(TARGET_DTBO_NOT_SUPPORTED),1)
   DEFINES += TARGET_DTBO_NOT_SUPPORTED=1
 endif

platform/msm_shared/dev_tree.c

@@ -75,7 +75,7 @@ struct dt_entry_v1
 	uint32_t size;
 };
 
-#if ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT
+#if UPDATE_ANDROID_FSTAB && (ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT)
 /* Look up table for fstab node */
 struct fstab_node
 {
@@ -2334,7 +2334,7 @@ int update_device_tree(void *fdt, const char *cmdline, enum boot_type boot_type,
 		}
 	}
 
-#if ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT
+#if UPDATE_ANDROID_FSTAB && (ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT)
 	/* Update fstab node */
 	dprintf(SPEW, "Start of fstab node update:%zu ms\n", platform_get_sclk_count());
 	if (update_fstab_node(fdt) != 0) {
@@ -2357,7 +2357,7 @@ int update_device_tree(void *fdt, const char *cmdline, enum boot_type boot_type,
 	return ret;
 }
 
-#if ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT
+#if UPDATE_ANDROID_FSTAB && (ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT)
 /*Update device tree for fstab node */
 static int update_fstab_node(void *fdt)
 {