platform/x86/intel/ifs: Refactor image loading code

mainline inclusion
from mainline-v6.7-rc1
commit a138ac2656d1329c3994a227769b7ba3926818a7
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8RCIK
CVE: N/A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a138ac2656d1329c3994a227769b7ba3926818a7



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Intel-SIG: commit a138ac2656d1 ("platform/x86/intel/ifs: Refactor image loading code")
Backport to support IFS SAF & Array BIST on GNR & SRF

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IFS image loading flow is slightly different for newer IFS generations.

In preparation for adding support for newer IFS generations, refactor
portions of existing image loading code for reuse.

Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Link: https://lore.kernel.org/r/20231005195137.3117166-3-jithu.joseph@intel.com


Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Aichun Shi <aichun.shi@intel.com>