ARM: dts: aspeed: everest: Add reserved memory for TPM event log

Trusted boot support requires the platform event log passed up
from the bootloader. In U-Boot, this can now be accomplished with
a reserved memory region, so add a region for this purpose to the
Everest BMC devicetree.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20230222015056.3903734-1-eajames@linux.ibm.com


Signed-off-by: Joel Stanley <joel@jms.id.au>