docs: Add Cortex-Hercules/HerculesAE CPU support
docs: Add Cortex-Hercules/HerculesAE CPU support

Signed-off-by: Lauren Wehrmeister <c2872bb20a24754ba136deb455abb6add7d102f7@arm.com>
Change-Id: Ia1ff13be1308e63c2854d2b6e5f6651750186abe

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware