UPSTREAM: firmware: arm_ffa: Upgrade FF-A version to v1.2 in the driver

The basic and mandatory features of FF-A v1.2 are all supported now.
The driver supported version can be bumped from v1.1 to v1.2

Tested-by: Viresh Kumar <viresh.kumar@linaro.org>
Message-Id: <20250217-ffa_updates-v3-11-bd1d9de615e7@arm.com>
Bug: 391968135
Change-Id: Iab60a8d5d8ce47d9da6a8e70deb8c7c43f16085b
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
(cherry picked from commit 9fac08d9)
Signed-off-by: Ayrton Munoz <ayrton@google.com>