Platform: corstone1000: Align with new bl1_1/bl1_2 changes

Splits boot_hal_bl1.c into boot_hal_bl1_1.c and boot_hal_bl1_2.c to
align with recent bl1_1/bl1_2 changes.

Signed-off-by: Emekcan Aras <emekcan.aras@arm.com>
Change-Id: If70b2e6589b9f21b1ec9a0b26c9d9f881c454d4c
12 files changed