drtm: use default Event Log hash option

Removed the deprecated TPM_HASH_ALG option. Since the build already
defaults to MBOOT_EL_HASH_ALG=sha256 for Event Log measurements,
there is no need to explicitly specify a build option for the hash
algorithm

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I4dc5a4bc28a252f5e9d78771ce2653d96f505899
1 file changed