fdt: common API to populate kaslr seed

fdt_fixup_kaslr_seed() will update given ofnode with random seed value.
Source for random seed can be TPM or RNG driver in u-boot or sec
firmware (ARM).

Signed-off-by: Dhananjay Phadke <dphadke@linux.microsoft.com>
Signed-off-by: Sean Edmond <seanedmond@microsoft.com>