fix(plat/arm): correct UUID strings in FVP DT
fix(plat/arm): correct UUID strings in FVP DT

The UUID strings used in FW_CONFIG DT are not aligned with UUIDs defined
in include/tools_share/firmware_image_package.h for BL32_EXTRA1 and
TRUSTED_KEY_CERT.

Signed-off-by: Yann Gautier <e753f6969c288905606e3c07464886d4f1fc1be0@foss.st.com>
Change-Id: I517f8f9311585931f2cb931e0588414da449b694

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