refactor: Modify the build params to disable Debug build for sun50i_a64

Errata framework and cpu porting of cortex-A53 to support the framework
introduces additional size related failures in sun50i_a64 related CI
builds. Disabling the debug flags resolves the issue, the release build
is used in the actual deployment and if debug option needs to be
enabled, enable SUNXI_BL31_IN_DRAM=1 to debug with DRAM.

Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
Change-Id: Ia5d303997d9df02f9d8eaa0d6f20c0ae7ae05724
2 files changed