Refactor reset manager into intel common platform directory as it can be
shared by both Stratix 10 and Agilex. Register address and field is now
referred through macros.

Signed-off-by: Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Change-Id: Id6d50f2a2f5a6bd8d6746b84602ac17ec7f6c07a

Add support for platform specific warm-reset through psci system reset 2.

- system_reset2 implementation that calls for l2 cache reset
- Check for magic number and request for warm reset in bl2
- Create a shared reset manager header file for Agilex and Stratix 10
- Clean up parameter info in plat_get_next_bl_params

Signed-off-by: Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Change-Id: I3fdd9a2711c80d9bd3dc05b81527781d840bd726