Musca B1: BL2: Fix public key stack corruption

Since thin psa crypto layer in BL2 does not copy the key data while
importing, its contents are corrupted by the following code. Hence
statically allocate key buffer instead.

Signed-off-by: Maulik Patel <maulik.patel@arm.com>
Change-Id: Idc7506b90eb0bc7cb6f4e6146e2db1c009a7e7ac
3 files changed