lib/prog_loaders: Allow platforms to skip stage cache

Before multi-CBFS support was added, x86 platforms cached their
ramstage in TSEG so that it could be re-used on the resume
path. However, more resources/assets are being put in cbfs that are
utilized during ramstage. Just caching ramstage does not mean that
correct cbfs region is used for all the data. Thus, provide an option
to allow platforms to skip caching any component for resume.

Change-Id: I0e957a6b859cc7d700aaff67209a17c6558be5de
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/14636
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/Kconfig

@@ -262,6 +262,13 @@ config CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM
 	 The relocated ramstage is saved in an area specified by the
 	 by the board and/or chipset.
 
+config NO_STAGE_CACHE
+	bool
+	default n
+	help
+	 Do not save any component in stage cache for resume path. On resume,
+	 all components would be read back from CBFS again.
+
 config FLASHMAP_OFFSET
 	hex "Flash Map Offset"
 	default 0x00670000 if NORTHBRIDGE_INTEL_SANDYBRIDGE