recovery: Fork a process for fuse when sideloading from SD card.

For applying update from SD card, we used to use a thread to serve the
file with fuse. Since accessing through fuse involves going from kernel
to userspace to kernel, it may run into deadlock (e.g. for mmap_sem)
when a page fault occurs. Switch to using a process instead.

Bug: 23783099
Bug: 26313124
Change-Id: Iac0f55b1bdb078cadb520cfe1133e70fbb26eadd
diff --git a/fuse_sdcard_provider.h b/fuse_sdcard_provider.h
index dc2982c..bdc60f2 100644
--- a/fuse_sdcard_provider.h
+++ b/fuse_sdcard_provider.h
@@ -17,7 +17,6 @@
 #ifndef __FUSE_SDCARD_PROVIDER_H
 #define __FUSE_SDCARD_PROVIDER_H
 
-void* start_sdcard_fuse(const char* path);
-void finish_sdcard_fuse(void* token);
+bool start_sdcard_fuse(const char* path);
 
 #endif