arm: dra7xx: Add vendor partition to Android GPT table for eMMC

Add vendor partition to Android GPT table for eMMC.

A Vendor image contains SoC-specific code and configuration.

Prior to Android 8.0, the vendor partition was optional ;
files belonging to these images were placed in boot.img or system.img
with symlinks (such as /vendor >/system/vendor ) when absent.

Android 8.0 makes the vendor partition mandatory

The goal is to modularize Android partitions with standard interface between
the Android Platform (on system.img ) and vendor-provided code(on vendor.img).

This standard interface enables the Android Platform to be updated
without affecting the SoC partitions. This makes it possible to upgrade a
device system.img from Android 8.0 to Android P while other images (such as
vendor.img) remain at Android 8.0. This modularity enables timely
Android platform upgrades (such as monthly security updates )
without requiring SoC/ODM partners to update SoC- and device-specific code.

Signed-off-by: Vishal Mahaveer <vishalm@ti.com>
Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/dra7xx_evm.h

@@ -66,6 +66,7 @@
 	"name=recovery,size=10M,uuid=${uuid_gpt_recovery};" \
 	"name=boot,size=10M,uuid=${uuid_gpt_boot};" \
 	"name=system,size=768M,uuid=${uuid_gpt_system};" \
+	"name=vendor,size=256M,uuid=${uuid_gpt_vendor};" \
 	"name=cache,size=256M,uuid=${uuid_gpt_cache};" \
 	"name=ipu1,size=1M,uuid=${uuid_gpt_ipu1};" \
 	"name=ipu2,size=1M,uuid=${uuid_gpt_ipu2};" \