platform: msm_shared: Add changes as per AVB2.0 specs

As per the requirement of AVB2.0 current call flow aboot_init
is updated to make sure that device is booting with AVB2.0
enable.Fix kernel cmdline for recovery and add checks to verify
the boot image.

Change-Id: Icfb250eac71edf07ea6f6123ddd15c6aaaa1629f
diff --git a/include/platform.h b/include/platform.h
index 55fd39e..f7a14cb 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -92,4 +92,7 @@
 bool platform_is_mdm9206();
 int is_vb_le_enabled();
 void* get_rpmb_snd_rcv_buff();
+int LoadImage(char *Pname, void **ImgBuf, uint32_t *ImgSzActual);
+void boot_verifier_init();
+uint32_t get_page_size();
 #endif