OvmfPkg/MemEncryptSevLib: Make the MemEncryptSevLib available for SEC

OvmfPkg/MemEncryptSevLib: Make the MemEncryptSevLib available for SEC

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3108

In preparation for a new interface to be added to the MemEncryptSevLib
library that will be used in SEC, create an SEC version of the library.

This requires the creation of SEC specific files.

Some of the current MemEncryptSevLib functions perform memory allocations
which cannot be performed in SEC, so these interfaces will return an error
during SEC. Also, the current MemEncryptSevLib library uses some static
variables to optimize access to variables, which cannot be used in SEC.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <bc7fa76cc23784ab3f37356b6c10dfec61942c38.1610045305.git.thomas.lendacky@amd.com>