IntelFsp2Pkg: Only include required header files in FspEas.h
IntelFsp2Pkg: Only include required header files in FspEas.h

Current FspEas.h file includes Uefi.h which also refers to lots of other
UEFI header files not used by FSP consumer. It caused many unnecessary
header file overhead for a bootloader that consumes FSP, such as coreboot.
This change reduces the required header file number down to 3.

Cc: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>
Cc: Giri P Mudusuru <25c53ebec15b492d82d7bf064153464c6e8fbfec@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Maurice Ma <ffe085a909ec0c7dac9a0ba92c906627ea2355ed@intel.com>
Reviewed by: Giri P Mudusuru <25c53ebec15b492d82d7bf064153464c6e8fbfec@intel.com>

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