ArmPkg: Add data structures to receive FF-A boot information

The SPMC will pass the manifest to the StMM SP which contains the boot
information required for SP initialisation. This patch defines the data
structures defined in Section 5.4 of the FF-A v1.1 BETA0 spec to enable this
support. The manifest is identified by the TF-A UUID_TOS_FW_CONFIG.

Signed-off-by: Achin Gupta <achin.gupta@arm.com>
Signed-off-by: Nishant Sharma <nishant.sharma@arm.com>
Change-Id: I2b4c77b25417720efc59a354c39ed580be262d5f