chore(smccc): bump up SMCCC version to 1.4

TF-A code supports SMCCC spec version 1.4 while version is still kept
1.2. Bump up the version.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ie5476c4601bd504d3f3e8433e1d672ebd0a758b1
1 file changed