ANDROID: KVM: arm64: Bump the version of supported smccc conduit to 1.2

Increase the advertised SMCCC version to 1.2 to allow the ARM FF-A
driver to probe. The version increase is compliant with the hypervisor
supported features and is a safe change because:

 - Permits calls to use R4—R7 as return register (Section 4.1).
 - Permits calls to use X4—X17 as return registers (Section 3.1).
 - Permits calls to use X8—X17 as argument registers (Section 3.1).

and the SMCCC_ARCH_SOC_ID (Section 7.4) call is safe to return not
supported. The requirement to present the SVE state across SMC/HVC
is already satisfied.

Bug: 269285339
Change-Id: I6f10e0764014775419752d1d0a114c682c6cba57
Signed-off-by: Sebastian Ene <sebastianene@google.com>